文档内容
小学数学简便运算专项练习 238 题(有答案)
9. ×23
1.(0.86+0.86+0.86+0.86)×25
2. 4÷1 +6× 10. 38 ﹣15.38+61.25﹣3.62
3. 125÷(50÷8) 11. 17.98+2.5×0.3﹣18÷1.5
4. 7.6× ÷[1.9﹣1.9×(1.9﹣1.9)]. 12. × + ×
5.999×999﹣2×999+1.
13.( + )÷ .
6.1.25×0.25×0.05×64
14.
7. 20.06×65+380×2.006﹣2.006×30.
8. ( ﹣ ÷4× )÷
15.
124.0.279×258+0.742×279
16.
25. 13÷28+11÷27+15÷28+38÷27.
26. ( + )×24×15
17. .
18. 22.7×1.25×0.8
27. 3.7× +5.3×0.75+ .
19. 3.91×2.8+6.09×2.8. 28. 9.9+99.9+999.9
20. 23.4×16﹣23.4×6
29. 6.8÷4﹣1.2×25%+4 ×0.25.
21. 20 ﹣5.75﹣14.25
30. 6.3+6.44+2.7+3.56
22. 1.25×0.25×32 31. 15.35﹣(5.35+7.2)
32. 600÷12
23. 56×( ﹣ + )
数学简便运算------ 2÷( ﹣ )×( ﹣ )
40.
33. 67×102.
34. 41. 9 ×4.25+4 ×
42. ( ﹣ )×4×9
35.
43. 1+2+3+4+…+49+50.
36.
44.4.8×0.25
37. .
45. 2.33×0.5×4
38. 1.3﹣3.79+9.7﹣6.21
46. 1.2×2.5+0.8×2.5
39. 3.64÷4+4.36×0.25
47. 3.7÷1.25÷8.
数学简便运算------ 348. 43.6+9.8+6.4
58. 630÷14
49. 17.3×0.25×8
59. 125×25×32
50. 2.31×1.5+1.5×7.69.
60. 210÷6÷5.
51. 10.24﹣6.67﹣1.33
61.125×32
52. 32000÷125÷8
62. 640÷5÷8
53. 7.31+15.05+2.69+4.95
63. 653﹣98
54. 47×101
64. 944+102.
55.573﹣298
65.25×79×4
56. 194+501
66. 8×166×25
57. 627﹣(427+189)
数学简便运算------ 467. 50×25×4×3
77. 2004×
68. 8×(25×15)
78. 81﹣(3.81﹣1.65)+2.25
69. (250×72)×4
79. 24×( ﹣ + ).
70. 5×25×13×40×20.
71. 7350÷25 80. ( + )×24
72. 54×101
81. + ×
73. 227+364+146+173
82. 2.5×3.2×1.25
74. 5604﹣(723+1604)
83. 4.05﹣(2.05+ )
×1.67+0.33×
75.
84. 5.39+ +4.61+
76. 999×667+667.
数学简便运算------ 585.0.588× +4×9.412+ ×0.588.
95. 4500÷25÷4
86.45×98+45×2
96. 125×32
87. 452﹣(152+240)
97. 654××99+346×99.
88. 99×27
98. 56×12.5
89. 1120÷16÷7
99. 14.6﹣(4.6+7.2)
90. 113×36﹣13×36
100. 99×99+199.
91. 179﹣245+321﹣155.
101.0.125×0.25×8×4
92.1.24+14.95+8.76﹣4.95
102. 1927﹣528﹣472.
93. 52.7﹣5.27﹣2.7
103. ( + + )×105
94. 35×201
数学简便运算------ 6104. × +25%× +0.25× 112. ( ﹣ )×17×15.
113. 6.3×8.7+8.7×3.7
2 +3 ﹣3 +1 +1
105.
114. ( ﹣ + )×12
106. 3.7×99+3.7
115. × + ÷ .
107.1.2×2.5+2.8×2.5
116. 7.25﹣3+3.75﹣6
108. 4.8×2.5.
117. 49×( + )×25
109. 4.05﹣2.86﹣0.14
× + ÷ ﹣ .
118.
110. 7 × +0.4×7
111. 2.25×3.14×4+3.14
119. ﹣ +
数学简便运算------ 7128. 178.4﹣45.3﹣54.7
120. ×12.5×8×0.4
129. 456﹣(256﹣144)
121. ×12.
130. 102×45
122. 25×0.32×1.25
131. 32×125×25
123. 0.37×79+3.7×2.1
132. 43×99+43
124. 2011÷2011 +
133. (40+8)×25
125. + ++ +
134. 73×99
126. ( ﹣ )×12
135. 54×11﹣54.
127. 1000+999×999.
136. 301×79
数学简便运算------ 8137. 125×72×4
147. 3.5%×9.9
138. 728×79十272×79
148. 1 +3 +5 +7 +9
139. 8.59+2.57+3.43+5.47
149. 2008×20072008﹣2006×20082007.
140. 49.62+27.17﹣19.62
150. 24.87﹣0.53﹣1.47
141. 1546﹣(546﹣239)
151. 50×
142. .
152. 0.375× .
143.1999+999×999.
153. 7.5+2.7+2.7+2.5+4.3
144. 4.37×6.3+4.37×3.7
154. 7.9﹣3.27﹣0.73+1.1
145. 2.64÷1.25÷0.8
155. 72×125
146. 10.2×0.45.
数学简便运算------ 9156. (80+4)×125 165. 1.25×32×2.5
157. 67×88+67×11+67
166. 4 ×3.5+4.8×7 ﹣480%
158. 203×15.
167.(5 ﹣1.8)÷[(1.15+ )×1 ]
159. 4392﹣2997
168. 3333×224+6666×368.
160. 2.5×32×1.25
169. 395﹣283+154+246﹣117
161. × + ÷
170. 8795﹣4998+2994﹣3002﹣2008
171. 1999+999×999
162. 13× +
172. 38×25×6.
163. 9÷[(20.75﹣9.5)]×0.4]
173. 2.06×101
164. ÷ ﹣ × .
数学简便运算------ 10174. 0.25×125×0.32 184. 15.4﹣(5.4+2.3)
175. 1.25×8.8 185. 98×45
176. 31.8×2.5+31.8×7.5.
186. 16×125×25
177. 19×8×125
187. 12×69﹣69×2
178. 38+129+71
188. (20+8)×25.
179. 1756﹣398
189. 9+99+999+9999+99999;
180. 406×201
190. 1﹣2+3﹣4+5﹣6+…﹣1992+1993.
181. 16×125
191. 36×11;
182. 1900÷4÷25.
192. 246×11.
183. 8.35+3.8﹣2.35
193. 678+(354+322)
数学简便运算------ 11203. 18 × +2
194. 283+147+17+1653
195. 384﹣(37+184) × ﹣ .
204.
196. 2904﹣1327﹣173
205. 0.8×7.3﹣63×20.08
197. 653﹣197
206. 65.5﹣4.29+24.6﹣5.71
198. 125×17﹣125
207. 1991+1989+2000+1995+2011+2005+1998+1993.
199. 235×99
208. 99999×22222+33333×33334
200. (1300﹣520)÷13
209. 2003×2004÷2004×2004﹣2003×2004
201. 67×21+18×21+85×79
210. 2.8×( + )
202. 222222×999999.
数学简便运算------ 12211. 101×
220. 3425﹣188﹣212﹣25
212. 9.81×10%+0.5×98.1+0.049×981 221. 567×999+567×2
222.( 91×48×75 )÷( 25×13×16)
213. 23× +14× .
223. ×3+ ×5+ ×10
214. 38.4×187﹣15.4×384+3.3×16=
224. 999×7+111×7
215. 3 ﹣(0.16+1 )﹣1.84
225. 97×
216. 2009÷2009
226. ( + + + )×2002
217. 9 +99 +999 +9999 ﹣
227. 8.5× +0.75×5+6.5÷1
218. 4.03÷12.5.
219. 1997+1998+1999+2001
数学简便运算------ 13+ + + + . 237..65×8.7+6.5×0.23﹣0.65
228.
.
238.
229. 1.25×1.25×32
230. 15×( + )×17.
231. 25×99+25
232. 75×75+75×25
233. 64×125
234. 17+64+83+36
235. 1200﹣128﹣72
236. 3000÷125÷8.
数学简便运算------ 146.1.25×0.25×0.05×64,
=1.25×0.25×0.05×(8×4×2),
=(1.25×8)×(0.25×4)×(0.05×2),
=10×1×0.1,
=1;
7. 20.06×65+380×2.006﹣2.006×30,
=20.06×65+(380﹣30)×2.006,
=20.06×65+350×2.006,
=20.06×65+(350÷10)×(2.006×10),
=20.06×65+35×20.06,
=20.06×(65+35),
=20.06×100,
=2006
8. ( ﹣ ÷4× )÷ ,
=( )÷ ,
答案: =( )×2,
1.(0.86+0.86+0.86+0.86)×25,
= 2,
=0.86×(4×25),
=0.86×100, ;
=
=86;
2. 4÷1 +6× , 9. ×23,
=(4+6)× , = (24﹣1),
=10× , = 24 ,
=6;
=23 ,
3. 125÷(50÷8),
=125×8÷50,
= ;
=1000÷50,
=20;
10. 38 ﹣15.38+61.25﹣3.62,
4. 7.6× ÷[1.9﹣1.9×(1.9﹣1.9)],
=38.75+61.25﹣(15.38+3.62),
=100﹣19,
=7.6× ÷[1.9﹣1.9×0],
=81;
11. 17.98+2.5×0.3﹣18÷1.5,
=7.6× ÷1.9,
=17.98+0.75﹣12,
=18.73﹣12,
=7.6× ,
=6.73;
=2
12. × + × ,
5.999×999﹣2×999+1,
=(1000﹣1)×(999﹣2)+1,
=( )× ,
=(1000﹣1)×997+1,
=1000×997﹣1×997+1,
=1× ,
=997000﹣997+1,
=996004
数学简便运算------ 15= ; 21. 20 ﹣5.75﹣14.25,
13.( + )÷ . =20 ﹣(5.75+14.25),
= , =20 ﹣20,
=2+1,
= ;
=3
22. 1.25×0.25×32,
14. ,
=1.25×0.25×8×4,
=1.25×8×(0.25×4),
=4.76+5.24+5 ,
=10×1,
=10;
=10+5 ,
23. 56×( ﹣ + ),
=15 ,
=56× ﹣56× +56× ,
15. ,
=24﹣21+2,
=5
=3 ﹣0.16﹣1 ﹣1.84,
24. 0.279×258+0.742×279,
=279×0.258+0.742×289,
=(3 ﹣1 )﹣(0.16+1.84),
=279×(0.258+0.742),
=2﹣2, =279×1,
=0; =279;
25. 13÷28+11÷27+15÷28+38÷27,
16. ,
= ,
=2.8﹣[0.43+( +1 )],
=( )+( ),
=2.8﹣[0.43+2],
=2.8﹣2.43,
=1+ ,
=0.37;
17. , =2
=9.56﹣(3 +2 ), 26. ( + )×24×15,
=9.56﹣6,
= ,
=3.56
18. 22.7×1.25×0.8, =150+24,
=22.7×(1.25×0.8), =174;
=22.7×1,
27. 3.7× +5.3×0.75+ .
=22.7;
19. 3.91×2.8+6.09×2.8, =(3.7+5.3+1)×0.75,
=(3.91+6.09)×2.8, =10×0.75,
=10×2.8, =7.5;
=28 28. 9.9+99.9+999.9,
20. 23.4×16﹣23.4×6, =(9.9+0.1)+(99.9+0.1)+(999.9+0.1)﹣0.1×3,
=(16﹣6)×23.4, =10+100+1000﹣0.3,
=10×23.4, =1110﹣0.3,
=234; =1109.7;
数学简便运算------ 1629. 6.8÷4﹣1.2×25%+4 ×0.25. = ,
=6.8× ﹣1.2× +4.4× , = ;
=(6.8﹣1.2+4.4)× , 37. .
=10× , =(1+3+5+7+9)+( )+( ) ,
=2.5
=25+( )+( ) ,
30. 6.3+6.44+2.7+3.56,
=(6.3+2.7)+(6.44+3.56),
=25+ + ,
=9+10,
=19;
=25+( ) ,
31. 15.35﹣(5.35+7.2),
=15.35﹣5.35﹣7.2,
=25+ ,
=10﹣7.2,
=2.8;
=25+( ),
32. 600÷12,
=600÷(6×2),
=25
=600÷6÷2,
=100÷2,
= .
=50;
33. 67×102, 38. 1.3﹣3.79+9.7﹣6.21,
=67×(100+2), =(1.3+9.7)﹣(3.79+6.21),
=67×100+67×2, =11﹣10,
=6700+134, =1;
=6834 39. 3.64÷4+4.36×0.25,
34. , =3.64× +4.36× ,
=4.85+5.15﹣( ), =(3.64+4.36)× ,
=10﹣1,
=8× ,
=9;
=2;
35. ,
40. ÷( ﹣ )×( ﹣ ),
= (4.75× ﹣3.6+6.15×3.6),
= ÷ × ,
= [(4.75+6.15﹣1)×3.6],
= × ,
= 9.9×3.6,
= ;
=3.96;
36. , 41. 9 ×4.25+4 × ,
= [ ], =9 ×4 +4 × ,
= , =(9 + )×4 ,
数学简便运算------ 17=10.24﹣(6.67+1.33),
=10× ,
=10.24﹣8,
=2.24;
= ;
52. 32000÷125÷8,
=32000÷(125×8),
42. ( ﹣ )×4×9,
=32000÷1000,
=32;
=( ﹣ )×(4×9),
53. 7.31+15.05+2.69+4.95,
=(7.31+2.69)+(15.05+4.95),
=( ﹣ )×36,
=10+20,
=30;
= ×36﹣ ×36,
54. 47×101,
=4﹣3, =47+(100+1),
=1; =47×100+47,
=4700+47,
43. 1+2+3+4+…+49+50, =4747
=(1+50)+(2+49)+(3+48)+…+(25+26), 55. 573﹣298,
=51+51+51+51+…+51, =573﹣300+2,
=51×25, =275;
=1275 56. 194+501,
44. 4.8×0.25, =194+500+1,
=1.2×(4×0.25), =695;
=1.2×1, 57. 627﹣(427+189),
=1.2; =627﹣427﹣189,
45. 2.33×0.5×4, =11;
=2.33×(0.5×4), 58. 630÷14,
=2.33×2, =630÷7÷2,
=4.66; =90÷2,
46. 1.2×2.5+0.8×2.5, =45;
=(1.2+0.8)×2.5, 59. 125×25×32,
=2×2.5, =(125×8)×(25×4),
=5; =1000×100,
47. 3.7÷1.25÷8. =100000;
=3.7÷(1.25×8), 60. 210÷6÷5,
=3.7÷10, =210÷(6×5),
=0.37 =210÷30,
48. 43.6+9.8+6.4, =7
=9.8+(43.6+6.4), 61. 125×32,
=9.8+50, =125×8×4,
=59.8; =1000×4,
49. 17.3×0.25×8, =4000;
=17.3×(0.25×8), 62. 640÷5÷8,
=17.3×2, =640÷(5×8),
=34.6; =640÷40,
50. 2.31×1.5+1.5×7.69. =16;
=(2.31+7.69)×1.5, 63. 653﹣98,
=10×1.5, =653﹣100+2,
=15 =453+2,
51. 10.24﹣6.67﹣1.33, =455;
数学简便运算------ 1864. 944+102,
= ;
=944+100+2,
=1044+2, 76. 999×667+667×1,
=1046 =667×(999+1),
65.25×79×4 =667×1000,
=25×4×79 =667000
=100×79
77. 2004× ,
=7900
66. 8×166×25
=(2003+1)× ,
=8×25×166
=200×166
=2003× +1× ,
=33200
67. 50×25×4×3
=2002+ ,
=(25×4)×(50×3)
=100×150
=2002 ;
=15000
68. 8×(25×15) 78. 81﹣(3.81﹣1.65)+2.25,
=8×25×15 =81﹣3.81+1.65+2.25,
=200×15 =(81﹣3.81)+(1.65+2.25),
=3000 =77.19+3.9,
69. (250×72)×4 =81.09;
=250×4×72
79. 24×( ﹣ + ),
=1000×72
=72000
=24× ﹣24× +24× ,
70. 5×25×13×40×20
=(25×40)×(5×20)×13 =20﹣6+16,
=1000×100×13 =14+16,
=1300000 =30
71. 7350÷25,
80. ( + )×24,
=(7350×4)÷(25×4),
=29400÷100,
= ×24+ ×24,
=294;
72. 54×101, =16+6,
=54×100+54, =22;
=5454;
81. + × ,
73. 227+364+146+173,
=(227+173)+(364+146),
= × + × ,
=400+510,
=910;
=( + )× ,
74. 5604﹣(723+1604),
= × ,
=5604﹣1604﹣723,
=3277
=
×1.67+0.33× ,
75.
82. 2.5×3.2×1.25,
=(2.5×0.4)×(8×1.25),
= ×(1.67+0.33),
=1×10,
=10;
= ×2,
数学简便运算------ 1993. 52.7﹣5.27﹣2.7,
83. 4.05﹣(2.05+ ),
=(52.7﹣2.7)﹣5.27,
=50﹣(5+0.27),
=4.05﹣2.05﹣ ,
=50﹣5﹣0.27,
=45﹣0.27,
=2﹣ ,
=44.73;
94. 35×201,
=1 ;
=35×(200+1),
=35×200+35,
84. 5.39+ +4.61+ ,
=7000+35,
=7035;
=(5.39+4.61)+(1 + ),
95. 4500÷25÷4,
=10+2, =4500÷(25×4),
=12; =4500÷100,
=45;
85. 0.588× +4×9.412+ ×0.588,
96. 125×32,
=(125×8)×4,
=0.588×(1 +2 )+4×9.412,
=1000×4,
=0.588×4+4×9.412, =4000;
=4×(0.588+9.412), 97. 654×99+346×99,
=4×10, =(654+346)×99,
=40 =1000×99,
86. 45×98+45×2, =99000
=45×(98+2), 98. 56×12.5,
=45×100, =7×(8×12.5),
=4500; =7×100,
87. 452﹣(152+240), =700;
=452﹣152﹣240, 99. 14.6﹣(4.6+7.2),
=60; =14.6﹣4.6﹣7.2,
88. 99×27, =10﹣7.2,
=(100﹣1)×27, =2.8;
=2700﹣27, 100. 99×99+199,
=2673; =99×99+99+100,
89. 1120÷16÷7, =99×(99+1)+100,
=1120÷(16×7), =99×100+100,
=1120÷112, =9900+100,
=10 =10000
90. 113×36﹣13×36, 101. 0.125×0.25×8×4,
=36×(113﹣13), =(0.125×8)×(0.25×4),
=36×100, =1×1,
=3600; =1;
91. 179﹣245+321﹣155, 102. 1927﹣528﹣472,
=(179+321)﹣(245+155), =1927﹣(528+472),
=400﹣400, =1927﹣1000,
=0 =927
92. 1.24+14.95+8.76﹣4.95,
103. ( + + )×105,
=(1.24+8.76)+(14.95﹣4.95),
=10+10,
= ×105+ ×105+ ×105,
=20;
数学简便运算------ 20=35+21+7, =2.25×4×3.14+3.14,
=56+7, =9×3.14+3.14,
=63; =(9+1)×3.14,
=10×3.14,
104. × +25%× +0.25× ,
=31.4;
= × + × + × , 112. ( ﹣ )×17×15,
=( + + )× , = ×15×17﹣ 17×15,
=17﹣5,
= × ,
=12
= ;
113.6.3×8.7+8.7×3.7
=(6.3+3.7)×8.7
105. 2 +3 ﹣3 +1 +1 ,
=10×8.7
=87;
=(2 +1 ﹣3 )+(1 +3 ),
114. ( ﹣ + )×12
=(4﹣3 )+5,
= ×12﹣ ×12+ ×12
= +5,
=4﹣2+3
=5;
=5 ;
115. × + ÷ .
106. 3.7×99+3.7,
=3.7×(99+1),
= × + ×
=3.7×100,
=370
=( + )×
107. 1.2×2.5+2.8×2.5,
=(1.2+2.8)×2.5,
=2×
=4×2.5,
=10;
=1
108. 4.8×2.5,
=(4×1.2)×2.5, 116. 7.25﹣3+3.75﹣6,
=(4×2.5)×1.2, =(7.25+3.75)﹣(3+6),
=10×1.2, =11﹣9,
=12 =2.
109. 4.05﹣2.86﹣0.14,
117. 49×( + )×25,
=4.05﹣(2.86+0.14),
=4.05﹣3,
=49× ×25,
=1.05;
=595;
110. +0.4× ,
118. ,
= (0.6+0.4),
= × + × ﹣ ,
= ×1,
=( )× ,
= ;
= × ,
111. 2.25×3.14×4+3.14,
数学简便运算------ 21= =1﹣ ,
119. ﹣ + , = ;
= , 126. ( ﹣ )×12,
=1 , = ×12﹣ ×12,
=7﹣6,
= ;
=1;
127. 1000+999×999,
120. ×12.5×8×0.4,
=1000+999×(1000﹣1),
=1000+999×1000﹣999×1,
=( )×(12.5×0.4),
=1000+999000﹣999,
=2×5, =1000000﹣999,
=10; =999001
128. 178.4﹣45.3﹣54.7,
121. ×12,
=178.4﹣(45.3+54.7),
=178.4﹣100,
=(24× )×12,
=78.4;
=(9﹣4)×12, 129. 456﹣(256﹣144),
=5×12, =456﹣256﹣144,
=60 =200﹣144,
122. 25×0.32×1.25, =56;
=25×0.4×0.8×1.25, 130. 102×45,
=(25×0.4)×(0.8×1.25), =100×45+2×45,
=10×1, =4500+90,
=10; =4590;
123. 0.37×79+3.7×2.1, 131. 32×125×25,
=3.7×7.9+3.7×2.1, =(8×125)×(4×25),
=3.7×(7.9+2.1), =1000×100,
=3.7×10, =100000;
=37; 132. 43×99+43,
=(99+1)×43,
124. 2011÷2011 + ,
=100×43,
=4300;
=2011÷ + ,
133. (40+8)×25,
=40×25+8×25,
=2011× + ,
=1000+200,
=1200;
=2001× ,
134. 73×99,
=73×100﹣73×1,
= + ,
=7300﹣73,
=1; =7227;
135. 54×11﹣54,
125. + + + + ,
=(11﹣1)×54,
=10×54,
=1﹣ + ﹣ + ﹣ + ﹣ + ﹣ ,
=540
136. 301×79,
数学简便运算------ 22=(300+1)×79, =4.5+0.9,
=300×79+1×79, =5.4.
=23700+79, 147. 3.5%×9.9,
=23779; =0.035×(10﹣0.1),
137. 125×72×4, =0.035×10﹣0.035×0.1,
=(125×4)×72, =0.35﹣0.0035,
=500×72, =0.3465;
=36000;
148. 1 +3 +5 +7 +9 ,
138. 728×79十272×79,
=79×(728+272),
=1+ +3+ +5+ +7+ +9+ ,
=79×1000,
=79000;
=(1+3+5+7+9)+( + + + + ),
139. 8.59+2.57+3.43+5.47,
=8.59+(2.57+3.43)+5.47,
=25+(1﹣ + ﹣ + ﹣ + ﹣ + ﹣ ),
=8.59+6+5.47,
=20.06;
=25+(1﹣ ),
140. 49.62+27.17﹣19.62,
=49.62﹣19.62+27.17,
=25+ ,
=30+27.17,
=57.17;
=25 ;
141. 1546﹣(546﹣239),
=1546﹣546+239, 149. 2008×20072008﹣2006×20082007,
=1000+239, =2008×(2007×10000+2007+1)﹣2006×
=1239 (2008×10000+2007),
=2008×2007×10000+2007×2008+2008﹣
142. × + × + × + × ,
2006×2008×10000﹣2006×2007,
=2008×10000+2×2007+2008,
=( + + + )× ,
=20080000+4014+2008,
=20086022
=( + + + )× ,
150. 24.87﹣0.53﹣1.47,
=24.87﹣(0.53+1.47),
= × ,
=24.87﹣2,
=22.87;
=
151. 50× ,
143.1999+999×999,
=(1000﹣1)×999+1999,
=50× ,
=999000﹣999+1999,
=999000+1000,=1000000 =15+20﹣12,
144. 4.37×6.3+4.37×3.7, =35﹣12,
=4.37×(6.3+3.7), =23;
=4.37×10,
152. 0.375× ,
=43.7;
145. 2.64÷1.25÷0.8,
= × + ﹣ ,
=2.64÷(1.25×0.8),
=2.64÷1,
=( +1﹣ )× ,
=2.64;
146. 10.2×0.45,
=8× ,
=(10+2)×0.45,
=10×0.45+2×0.45, =3
数学简便运算------ 23153. 7.5+2.7+2.7+2.5+4.3 163. 9÷[(20.75﹣9.5)]×0.4],
=(7.5+2.5)+(2.7+4.3)+2.7, =9÷[11.25×0.4],
=10+7+2.7, =9÷[(10+1.25)×0.4],
=19.7; =9÷[10×0.4+1.25×0.4],
154. 7.9﹣3.27﹣0.73+1.1 =9÷[4+0.5],
=7.9+1.1﹣(3.27+0.73), =9÷4.5,
=9﹣4, =2;
=5;
164. ÷ ﹣ × ,
155. 72×125
=9×8×125,
= ﹣ × ,
=9×(8×125),
=9×1000,
= ×(1﹣ ),
=9000;
156. (80+4)×125
= × ,
=80×125+4×125,
=10000+500, =0.3
=10500; 165. 1.25×32×2.5,
157. 67×88+67×11+67 =(1.25×8)×(4×2.5),
=(88+11+1)×67, =10×10,
=100×67, =100;
=6700.
166. 4 ×3.5+4.8×7 ﹣480%,
158. 203×15
=(200+3)×15, =4.8×3.5+4.8×7.5﹣4.8×1,
=200×15+3×15, =4.8×(3.5+7.5﹣1),
=3000+45, =4.8×10,
=3045 =48;
159. 4392﹣2997,
167. (5 ﹣1.8)÷[(1.15+ )×1 ],
=4392﹣3000+3,
=1392+3,
=(5 ﹣1 )÷[(1 + )× ],
=1395;
160. 2.5×32×1.25,
= ÷[ × ],
=(2.5×4)×(8×1.25),
=10×10,
= ÷3,
=100;
161. × + ÷ , = ;
168. 3333×224+6666×368,
=( )× ,
=3333×224+3333×2×368,
=3333×(224+736),
=1× ,
=3333×960,
=3199680
= ;
169. 395﹣283+154+246﹣117
=395+(154+246)﹣(283+117)
162. 13× + ,
=395+400﹣400
=395;
=(13+1)× ,
171. 8795﹣4998+2994﹣3002﹣2008
=8795+2994﹣(4998+3002)﹣2008
=14× ,
=11789﹣8000﹣2008
=6; =1781;
数学简便运算------ 24171. 1999+999×999 =2000;
=1999+999×(1000﹣1) 182. 1900÷4÷25,
=1999+999000﹣999 =1900÷(4×25),
=1000+999000 =1900÷100,
=1000000; =19
172. 38×25×6 183. 8.35+3.8﹣2.35,
=38×(25×6) =8.35﹣2.35+3.8,
=38×150 =6+3.8,
=5700 =9.8;
173. 2.06×101 184. 15.4﹣(5.4+2.3),
=2.06×(100+1) =15.4﹣5.4﹣2.3,
=2.06×100+2.06×1 =10﹣2.3,
=206+2.06 =7.7;
=208.06; 185. 98×45,
174. 0.25×125×0.32 =(100﹣2)×45,
=0.25×125×0.4×0.8 =100×45﹣2×45,
=(0.25×0.4)×(125×0.8) =4500﹣90,
=0.1×100 =4410;
=10; 186. 16×125×25,
175. 1.25×8.8 =(8×125)×(2×25),
=1.25×(8+0.8) =1000×50,
=1.25×8+1.25×0.8 =50000;
=10+1 187. 12×69﹣69×2,
=11; =(12﹣2)×69,
176. 31.8×2.5+31.8×7.5 =10×69,
=31.8×(2.5+7.5) =690;
=31.8×10 188. (20+8)×25,
=318 =20×25+8×25,
177. 119×8×125, =500+200,
=119×(8×125), =700
=119×1000, 189. 9+99+999+9999+99999
=119000; =(10﹣1)+(100﹣1)+(1000﹣1)+(10000﹣1)+(100000
178. 38+129+71, ﹣1)
=38+(129+71), =10+100+1000+10000+100000﹣5
=38+200, =111110﹣5
=238; =111105;
179. 1756﹣398, 190. 1﹣2+3﹣4+5﹣6++1991﹣1992+1993
=1756﹣400+2, =1+(3﹣2)+(5﹣4)+(7﹣6)++(1991﹣1990)+(1993﹣
=1356+2, 1992)
=1358; =1+1×996
180. 406×201, =997
=406×(200+1), 191. 36×11
=406×200+406×1, =36×(10+1)
=81200+406, =36×10+36×1
=81606; =360+36
181. 16×125, =396;
=2×8×125, 192. 246×11
=2×(8×125), =246×(10+1)
=2×1000, =246×10+246×1
数学简便运算------ 25=2460+246
203. 18 × +2,
=2706
193. 678+354+322
= × +2,
=678+322+354
=1000+354 =17.67+2,
=1354; =19.67;
194. 283+147+17+1653
204. × ﹣ ,
=283+17+(147+1653)
=300+1800
= ﹣ ,
=2100;
195. 384﹣(37+184)
= ﹣ ,
=384﹣(184+37)
=384﹣184﹣37
=﹣ ;
=200﹣37
=163; 205. 0.8×7.3﹣63×20.08
196. 2904﹣1327﹣173 =5.84﹣1265.04,
=2904﹣(1327+173) =﹣1259.2;
=2904﹣1500 206. 65.5﹣4.29+24.6﹣5.71,
=1404; =(65.5+24.6)﹣(4.29+5.71),
197. 653﹣197 =90.1﹣10,
=653﹣200+3 =80.1;
=453+3 207. 1991+1995+2000+1989+2011+2005+1998+1993,
=456; =(2000﹣9)+(2000﹣5)+2000+(2000﹣
198. 125×17﹣125 11)+(2000+11)+(2000+5)+(2000﹣2)+(2000﹣7),
=125×(17﹣1) =2000×8﹣9﹣5﹣11+11+5﹣2﹣7,
=125×16 =16000﹣18,
=125×8×2 =15982
=1000×2 208. 99999×22222+33333×33334,
=2000; =33333×3×22222+33333×33334,
199. 235×99 =33333×(66666+33334)
=235×(100﹣1) =33333×100000,
=235×100﹣235×1 =3333300000;
=23500﹣235 209. 2003×2004÷2004×2004﹣2003×2004,
=23265; =2003×2004﹣2003×2004,
200. (1300﹣520)÷13 =0;
=1300÷13﹣520÷13
210. 2.8×( + ),
=100﹣40
=60;
=2.8× +2.8× ,
201. 67×21+18×21+85×79
=21×(67+18)+85×79 =0.4+0.3,
=21×85+85×79 =0.7;
=85×(21+79)
211. 101× ,
=85×100
=8500;
=(102﹣1)× ,
202. 222222×999999
=222222×(1000000﹣1)
=102× ﹣1× ,
=222222×1000000﹣222222×1
=222222000000﹣222222
=99﹣ ,
=222221777778
数学简便运算------ 26=98 ; =[(9+99+999+9999)+( )]﹣ ,
212. 9.81×10%+0.5×98.1+0.049×981,
=[10+100+1000+10000﹣4+ ]﹣ ,
=9.81×0.1+5×9.81+4.9×9.81,
=9.81×(0.1+5+4.9), =11110﹣4,
=9.81×10, =11106;
=98.1; 218. 4.03÷12.5,
=(4.03×8)÷(12.5×8),
213. 23× +14× ,
=32.24÷100,
=0.3224
=23× +16× ,
219. 1997+1998+1999+2001
=(2000﹣3)+(2000﹣2)+(2000﹣1)+(2000+1)
=(23+16)× ,
=2000×4﹣5
=7995;
=39× ,
220. 3425﹣188﹣212﹣25
=14 =3425﹣(188+212)﹣25
214. 38.4×187﹣15.4×384+3.3×16 =3425﹣400﹣25
=38.4×(187﹣154)+3.3×16 =3000;
=38.4×33+3.3×16 221. 567×999+567×2
=3.3×(384+16) =567×(999+2)
=3.3×400 =567×(1000+1)
=1320 =567×1000+567
=567000+567
215. 3 ﹣(0.16+1 )﹣1.84,
=567567;
222. (91×48×75)÷(25×13×16)
=3 ﹣0.16﹣1 ﹣1.84,
=(63×25×13×16)÷(25×13×16)
=63×(25×13×16)÷(25×13×16)
=3 ﹣1 ﹣(0.16+1.84),
=63
=2﹣2,
223.. ×3+ ×5+ ×10,
=0;
216. 2009÷2009 , = ×(3+5+10),
=2009 , = ×18,
=5;
=2009 ,
224. 999×7+111×7,
=7×(999+111),
=2009× ,
=7×1110,
=7770,
= ;
225. 97× ,
或1÷(2009 ÷2009),
=(96+1)× ,
=1÷1 ,
=96× +1× ,
= .
=5+ ,
217. 9 +99 +999 +9999 ﹣ ,
=5 ;
数学简便运算------ 27=200;
226. ( + + + )×2002,
235. 1200﹣128﹣72,
=1200﹣(128+72),
= ×2002+ ×2002+ ×2002+ ×2002;
=1200﹣200,
=1001+286+182+154, =1000;
=1623; 236. 3000÷125÷8,
=3000÷(125×8),
227. 8.5× +0.75×5+6.5÷1 ,
=3000÷1000,
=3
=8.5× + ×5+6.5× ,
237. 65×8.7+6.5×0.23﹣0.65
=565.5+1.495﹣0.65,
= ×(8.5+5+6.5),
=566.995﹣0.65,
=566.345;
= ×20,
238. ,
=15;
+ + + + ,
=1 … ,
228.
= + + + + + + + + + ﹣1, =1﹣ ,
=1+10+100+1000+10000﹣1,
=
=11110
229.1.25×1.25×32,
=(1.25×8)×(1.25×4),
=10×5,
=50;
230. 15×( + )×17,
=( + )×17×15,
= ×17×15+ ×17×15,
=17+15,
=32
231. 25×99+25,
=25×(99+1),
=25×100,
=2500;
232. 75×75+75×25,
=75×(75+25),
=75×100,
=7500;
233. 64×125,
=8×8×125,
=8×(8×125),
=8×1000,
=8000;
234. 17+64+83+36,
=(17+83)+(64+36),
=100+100,
数学简便运算------ 28