文档内容
分数加减法简便运算专项练习 136 题(有答案)
(1) + + ﹣ (7) ﹣( + )
(2) ﹣( ﹣ ) (8) ﹣ ﹣
(3) . (9) ﹣ + ﹣ .
(4) ﹣( ﹣ )
(10) .
(11) 999 +99 +9 + .
(5) + + +
(12) + + + + + + + +
(6) + ﹣ + (13) ﹣ + ﹣
分数加减法简便运算-- 1(14) ﹣( ﹣1) (23) + + +
(15) 2﹣ ﹣ . (24)
(16) ﹣0.4+ ﹣ . (25)
(17) . (26) + ﹣
(18) (27) ﹣( ﹣ )
(19) (28) + +
(20) (29) 3﹣
(21) + ﹣ (30)
(22) 1﹣ ﹣ (31) 4﹣ ﹣
分数加减法简便运算-- 2(32) . (41) 11﹣ ﹣ .
(33) +( + ) (42)
(34) ﹣( + ) (43) 3.5﹣ ﹣ .
(35) + + + . (44) + + + ﹣ ﹣ .
(36) + + + (45) ﹣ + ﹣
(37) + ﹣ (46) ﹣( + )
(38) + ﹣ + (47) + + + .
(39) +( ﹣ )+ (48) 6﹣ ﹣
(40) 0.58+ +1.12+ (49) ﹣ +
分数加减法简便运算-- 3(50) ﹣( ﹣ ) (59) ﹣ +
(51) + ﹣ (60) + + +
(52) + + + (61) ﹣( + )
(53) ﹣ + ﹣ (62) 1﹣ ﹣ ﹣ ﹣ ﹣
(54) + + + (63) 6﹣ ﹣
(55) 8﹣ ﹣
(64) ﹣ + ﹣
(56) + ﹣ +
(65) ﹣( ﹣ )
(57) ﹣( + )
(66) ﹣( + )
(58) 2﹣ ﹣
(67) .
分数加减法简便运算-- 4(68) 1﹣( )﹣ (76) + +
(77) ﹣ +
.
(78) + + +
(69) ﹣( + )
+2 + +3 ,
(79)
(70) + +
(80) + + ,
(71) ﹣( ﹣ )
(81) + + + ,
(72) + ﹣ + .
(82) ,
(73) .
(83) ﹣( + ),
(74) .
(84)
(75) ﹣ +
分数加减法简便运算-- 5(85) (94) ﹣ + ﹣ ,
(86) ﹣ + ,
(95) ﹣( ﹣ ),
(87) ,
(96)1﹣ ,
(88) + ﹣ + ,
(97) + ,
(89) ,
(98) ,
(90)(2 ﹣1 )﹣(1 ﹣2 )
(99) ,
(90)(2 ﹣1 )﹣(1 ﹣2 ),
(100) ,
(91)19.76﹣4 ﹣3 ,
(101)16×(1000+ ),
(92)8 ﹣8 +2 ,
(102)2﹣ ,
(93)2.5×1.25×32,
分数加减法简便运算-- 6(103)11 +13 +15 +17 +19 +21 , (113) ,
(104) (114) ﹣( ﹣ ),
(105) (115) ﹣( ﹣ ),
(106)51.27﹣8.66﹣1.34
(116) + + +
(107)32.5÷(0.05×50)
(117)5 +1 +3 +2 +6 +4 + ,
(108)
(118) ﹣ + ﹣ ,
(109) .
(119)( )﹣(1.375﹣ )
(110) + + ﹣
(120) + + +
(111) ﹣( ﹣ )
(121) + + + + + ,
(112) ﹣( + )
分数加减法简便运算-- 7(122) + + , (130) ,
(123) + + + , (131) ﹣ + ﹣ ,
(124) + + + + , (132) ﹣( ﹣ )
(125) ﹣ + , (133)5﹣ ﹣ ﹣ ,
(126)5﹣ ﹣1 , (134) ﹣(10﹣6)÷8,
(127) + + + , (135) + +
(128) , (136) + ﹣ +
(129)1﹣ ﹣ ,
分数加减法简便运算-- 8参考答案:
=16
(1) + + ﹣ ,
(4) ﹣( ﹣ ),
=( + )+( ﹣ ),
= ﹣ ,
=1+0,
=1;
= ;
(2) ﹣( ﹣ ),
(5) + + + ,
= ﹣ + ,
=( + )+( + ),
=
=1+1,
, =2;
(3)
(6) + ﹣ + ,
=( )+( + ),
=( + )+( ﹣ ),
=7+9,
分数加减法简便运算-- 9=1+0,
(13) ﹣ + ﹣ ,
=1
(7) ﹣( + ), =( + )﹣( + ),
= ﹣ ﹣ , = ﹣1,
= , =
= ; (14) ﹣( ﹣1),
(8) ﹣ ﹣ , = ﹣ +1,
= ﹣( + ), = +1,
= ﹣1, =1 ;
= ; (15)2﹣ ﹣ ,
(9) ﹣ + ﹣ , =2﹣( + ),
=2﹣1,
=( + )﹣( + ),
=1
=1﹣1,
9. ﹣0.4+ ﹣ ,
=0.
(10)11 ﹣2 +3 ﹣0.2, = ﹣ + ﹣ ,
=11 +3 ﹣(0.2+2 ), =( + )﹣( + ),
=15﹣(0.2+2.8), =1﹣1,
=15﹣3, =0
=12 ,
(16)
(11)999 +99 +9 + ,
=( )+( ),
=(999+99+9)+ ×3+ ,
=2+3,
=5.
=[(1000﹣1)+(100﹣1)+(10﹣1) +( + ),
(17) + + + ,
=1110﹣3+3, ]
=1110
=( + )+( + ),
(12) + + + + + + + + ,
= +1,
= + + + + +( + )+( + )+( + )+( + ),
=1 ;
= + + + + +( + )+( + )+( + )+( ),
(18)4﹣ ﹣ ,
= ×3+( + )+( ×3)+( + 2)+( ),
=4﹣( + ),
=1+1+1+1+1,
=5; =4﹣1,
分数加减法简便运算-- 10=3;
= ﹣ ,
(19) +( + ),
= ;
= + + ,
(27) ﹣( ﹣ ),
=( + )+ ,
= ﹣ ,
=1+ ,
= ;
=1 .
(28) + + ,
(20) + ﹣ ,
=( + )+ ,
= + ﹣ ,
=1+ ,
= ;
=1 ;
(21)1﹣ ﹣ ,
(29)3﹣ ,
=1﹣( + ),
=3﹣ ﹣ ﹣ ,
=1﹣1,
=0;
=(3﹣ )﹣( + ),
(22) ﹣ ,
=2 ﹣1,
= ﹣ ,
=1 ;
= ;
(30) ,
(23) + + + ,
=( + )+( + ),
=( + )+( + ),
=1+1,
=1+1, =2;
=2;
(31)4﹣ ﹣ ,
(24)4 ﹣2 ﹣1 ,
=3 ﹣ ,
=4 ﹣2 ﹣1 ,
=3 ﹣ ,
=﹣ ;
=2 ,
(25)7﹣( ﹣ ),
(32)1 ﹣ +3 ﹣ ,
=7﹣ ,
=1 +3 ﹣( + ),
=6 .
=5 ﹣1,
(26) + ﹣ ,
分数加减法简便运算-- 11=4 =( ﹣ )+( + ),
(33) +( + ), = +1,
= + + , =1 ;
=1+ , (40)0.58+ +1.12+ ,
=1 ; =(0.58+1.12)+( + ),
=1.7+1,
(34) ﹣( + ),
=2.7;
= ﹣ ﹣ , (41)11﹣ ﹣ ,
= ﹣ , =11﹣( + ),
=11﹣1,
= ;
=10.
(35) + + + , (42) ,
= + +( + ), =( )﹣ ,
=1+1,
=1﹣ ,
=2.
(36) + + + , = ;
=( + )+( + ), (43)3.5 ,
=1+1,
=3.5﹣( ),
=2;
=3.5﹣1,
(37) + ﹣ ,
=2.5
= +( ﹣ ), (44) + + + ﹣ ﹣ ,
= + , =( + )+( + )﹣( + ),
= ; =1+ ﹣ ,
(38) + ﹣ + , =1 ﹣ ,
=( ﹣ )+( + ), =1
= ; (45) ﹣ + ﹣ ,
(39) +( ﹣ )+ , = + ﹣( + ),
=1﹣1,
= + ﹣ + ,
=0;
分数加减法简便运算-- 12(46) ﹣( + ), =( + )+( + ),
=1+1,
= ﹣ ﹣ ,
=2;
=2﹣ , (53) ﹣ + ﹣ ,
=1 ; =( + )﹣( + ),
=1﹣1,
(47) + + + ,
=0.
= + +( + ), (54) + + +
=1+1,
=( )+( + ),
=2.
(48)6﹣ ﹣ , =1+ ,
=6﹣( + ), =1 ;
=6﹣1,
(55)8﹣
=5;
(49) ﹣ + , =8﹣( ),
= + ﹣ , =8﹣ ,
=1﹣ , =7 ;
= ; (56) ﹣
(50) ﹣( ﹣ ), =( )+( ),
=0+1,
= ﹣ + ,
=1;
= + ﹣ , (57) ( )
=1﹣ , = ﹣ ,
= ; = ,
=0.
(51) + ﹣ ,
(58)2﹣ ﹣ ,
= ﹣ + ,
=2﹣( + ),
=1+ ,
=2﹣ ,
=1 ;
= ;
(52) + + + ,
(59) ﹣ + ,
分数加减法简便运算-- 13= ﹣( ), = ﹣ + ,
= ﹣ , = + ﹣ ,
= ; =1﹣ ,
(60) + + + , = ;
=( + )+( ), (66) ﹣( + ),
= 1, = ﹣ ﹣ ,
= ; = ﹣ ,
(61) ﹣( + ), = .
= , (67) ,
= , =1﹣ +1﹣ +1﹣ +1﹣ +1﹣ +1﹣ ,
= . =6﹣ ﹣ ﹣ ,
(62)1﹣ ﹣ ﹣ ﹣ ﹣ , =6﹣ ,
= ﹣ ﹣ ﹣ ﹣ , = .
= ﹣ ﹣ ﹣ , (68)1﹣( )﹣
= ﹣ ﹣ , ,
= ﹣ , =1﹣ + ﹣ + ﹣ + ﹣ + ,
= ; =(1﹣ )+( ﹣ )+( ﹣ )+( ﹣ )+ ,
(63)6﹣ ﹣ , = +0+0+0+ ,
=6﹣( + ), =
=6﹣1,
(69) ﹣( + )
=5;
(64) ﹣ + ﹣ , = ﹣ ,
=( + )﹣( + ), = ;
=1﹣1,
(70) + +
=0;
(65) ﹣( ﹣ ), = + + ,
分数加减法简便运算-- 14=1+ , =1+ ,
=1 ; =1 ;
(71) ﹣( ) (77) ,
= ﹣ + , = ,
= ; = ;
(72) + ﹣ + (78) ,
=( )+( + ), = ,
=0+1,
=2+ ,
=1.
(73) +3 + +1 , =2 .
+2 + +3 ,
=( +3 )+( +1 ), (79)
=3 +2, =( + )+(2 +3 ),
=1+6,
=5
=7.
(74) , (80) + + ,
= + + + + + + + = + + ,
+ , =1+ ,
= ﹣ + ﹣ + ﹣ + ﹣ + ﹣ + ﹣ + ﹣ + ﹣ =1 ;
+ ﹣ , (81) + + + ,
= ﹣ , =( + )+( + ),
=1+1,
= .
=2
(75) , (82) ,
= , =( + )+( + ),
=1+2,
=1 ;
=3;
(76) , (83) ﹣( + ),
= , = ﹣ ﹣ ,
分数加减法简便运算-- 15= ﹣ ﹣ , =1 ;
=1﹣ , (89) ,
= . =( )+( ),
=1+1,
(84)
=2.
=(2 +7 )+(7 +2 ), (90)(2 ﹣1 )﹣(1 ﹣2 )
=10+10,
(90)(2 ﹣1 )﹣(1 ﹣2 ),
=20;
(85) =2 ﹣1 ﹣1 +2 ,
=(1+ )+(2+ )+(3+ )+(4+ )+(5+ ), =(2 +2 )﹣(1 +1 ),
=(1+2+3+4+5)+( + + + + ), =4 ﹣3,
=15+( + + + + ﹣ ), =1 ;
=15+(1+ + ), (91)19.76﹣4 ﹣3 ,
=16+ , =19.76﹣(4 +3 ),
=19.76﹣8,
=16 ;
=11.76;
(86) ﹣ + , (92)8 ﹣8 +2 ,
= + ﹣ , =8+ ﹣(8+ )+(2+ ),
=1﹣ , =8+ ﹣8﹣ +2+ ,
= . =(8﹣8+2)+( ﹣ + ),
(87) , =2+1 ,
=( ) , =3 ;
(93)2.5×1.25×32,
=1 ,
=2.5×1.25×4×8,
=(2.5×4)×(1.25×8),
=1 ;
=10×10,
=100.
(88) + ﹣ + ,
(94) ﹣ + ﹣ ,
=( )+( ),
=( + )﹣( + ),
=0+1 ,
=1﹣1,
=0;
分数加减法简便运算-- 16(95) ﹣( ﹣ ), (101)16×(1000+ ),
=( + )﹣ , =16000+16× ,
=16000+1,
=1﹣ ,
=16001;
= . (102)2﹣ ,
(96)1﹣ , =2﹣( )+( ),
=1﹣( + ), =2﹣1 ,
=1﹣1,
= ,
=0;
(97) + , = ,
=( ) , =
=1﹣ , (103).11 +13 +15 +17 +19 +21 ,
= ; =(11+13+15+17+19+21)+( + + + + + ),
(98) , =(11+21)×6÷2+(1﹣ + ﹣ + ﹣ + ﹣ + ﹣ +
=( )+( ), ),
=1+ , =96+(1﹣ ),
=1 . =96+ ,
(99) , =96 .
=10 ﹣(5 +4 ), (104)
=10 ﹣9 , (105)
(106)51.27﹣8.66﹣1.34
=(9﹣9)+(1 ﹣ ),
(107)32.5÷(0.05×50)
= ; (108)
(100) , (109) .
= ﹣ + , (104)
=0+ , = ,
= . =1+ ,
分数加减法简便运算-- 17= ; =1﹣ ,
(105) = ;
= , (112) ﹣( + ),
= ; = ﹣ ,
(106)51.27﹣8.66﹣1.34
= ﹣ ,
=51.27﹣(8.66+1.34),
=51.27﹣10,
=
=41.27;
(107)32.5÷(0.05×50)
(113) ,
=32.5÷ ,
=( )+( ﹣ )+( ﹣ )+…+( ﹣ ),
= ,
= + ﹣ + ﹣ +…+ ﹣ ,
=13;
(108) = ﹣ ,
= , = .
= , (114) ﹣( ﹣ ),
= ; = ﹣( ﹣ ),
(109) = ﹣ ,
= , = ;
= (115) ﹣( ﹣ ),
(110) + + ﹣ = ﹣ + ,
(111) ﹣( ﹣ ) =1 ;
(112) ﹣( + ) (116) + + +
(110) + + ﹣ , =( + )+( + )
=( + )+( ﹣ ), =1+
=1﹣0,
=1
=1;
(111) ﹣( ﹣ ), (117)5 +1 +3 +2 +6 +4 + ,
=( + )﹣ , =(5 +2 +4 )+(1 +6 )+(3 + ),
=12+8+4,
分数加减法简便运算-- 18=24
= ;
(118) ﹣ + ﹣ ,
(123) + + + ,
= + ﹣ ﹣ ,
=(1﹣ )+( ﹣ )+( ﹣ )+( ﹣ ),
=( + )﹣( + ),
=1 + ﹣ + ﹣ + ﹣ ,
=1﹣1,
=0.
=1﹣ ,
(119)( )﹣(1.375﹣ )
= ,
= ﹣1.375+
(124) + + + + ,
=2 + +3 ﹣1.375
=(1﹣ )+( ﹣ )+( ﹣ )+( ﹣ )+( ﹣ ),
=3+1
=1﹣ + ﹣ + ﹣ + ﹣ + ﹣ ,
= .
=1﹣ ,
(120) + + +
=
= + × + × + × ,
(125) ﹣ + ,
= ×(1+ )+ ×( + ),
= ﹣ + ,
= + × ,
= ;
= ×(1+ ),
(126)5﹣ ﹣1 ,
= × ,
=5﹣( +1 ),
= .
=5﹣2,
=3;
(121) + + + + + ,
(127) + + + ,
= + + + + + ,
=( + )+( + ),
=1﹣ + ﹣ + ﹣ + ﹣ + ﹣ + ,
=1+1,
=1 =2
(122) + + , (128) ,
=(1﹣ )+( ﹣ )+( ﹣ ), =( )+( )+( ﹣ )+( ﹣
=1﹣ + ﹣ , )+( ﹣ )+( ﹣ ),
=1﹣ ,
分数加减法简便运算-- 19=1;
=(4 ﹣4 )+(4 ﹣4 )+(4 ﹣4 )+(3 ﹣ )
(132) ﹣( ﹣ )
+(4 ﹣4 )+(12 ﹣12 ),
= ﹣
= ﹣ + ﹣ + ﹣ + ﹣ + ﹣ + ﹣
= ;
,
(133)5﹣ ﹣ ﹣ ,
= + + + + ﹣ ,
=5﹣( + + ),
= + ﹣ + + + ,
=5﹣2,
=3;
=2+ + + ,
(134) ﹣(10﹣6)÷8,
=4 ;
= ﹣4÷8,
(129)1﹣ ﹣ ,
= ﹣ ,
=1﹣( ﹣ ),
=
=1﹣ ,
(135) + +
= ;
= + + ,
(130) ,
=1+ ,
= ﹣ + ,
=1 ;
=0+ ,
(136) + ﹣ +
=
= + + ﹣ ,
(131) ﹣ + ﹣ ,
=1 ﹣ ,
=( + )﹣( + ),
=1 ;
=2﹣1,
分数加减法简便运算-- 20