文档内容
四则运算 简便计算(4)乘除
(1)45×4×5 (2)23 ×5×2
(3)25×9×4 (4)8×(125×13)
(5)(250×125)×(4×8) (6)88×125
(7)72×125 (8)125×64×25(9)42×125×8×5 (10)25×4×88×125
(11)(12+50)×40 (12)125×(40-4)
(13) 76×103 (14)18×125
(15)25×44 (16)42×25
(17)99×9 (18)99×78(19)45×37+37×55 (20)28×21+28×79
(21)17×23-23×7 (22) 38×46+64×38
(23)99×32+32 (24) 46+46×59
(25)167×2+167×3+167×5 (26)39×8+6×39-39×4
(27)28×225-2×225-6×225 (28)(42+25)×125+(18+15)×125
( 29 ) 23×2×4+25×4×2+27×1×8+25×8×1 ( 30 )
99×22+33×34
(31)360÷4÷9 (32) 250÷5÷2
(33)600÷12÷5 (34)800÷5÷8(35)480÷5÷48 (36)240÷5÷12
(37)420÷35 (38)2400÷25
(39)7800÷12 (40)960×46÷48
( 41 ) 99000÷121×11 ( 42 )
3702×38÷1234(43)640÷(16÷4) (44)1000÷
(125÷4)
参考答案
(1)45×4×5 (2)23 ×5×2 (3)25×9×4
=45×(4×5) =23×(5×2) =25×4×9
=900 =230 =900
(4)8×(125×13) (5)(250×125)×(4×8) (6)
88×125
=8×125×13 =125×8×(250×4) =8×125×11
=13000 =1000000 =11000
( 7 ) 72×125 ( 8 ) 125×64×25 ( 9 )
42×125×8×5=8×125×9 =125×8×(25×8) =42×5×(125×8)
=9000 =200000 = 210000
(10)25×4×88×125
=100×(8×125) ×11
=1100000
(11)(12+50)×40 (12)125×(40-4) (13)76×103
=12×40+50×40 =125×40-125×4 =76×(100+3)
=2480 =4500 =76×100+76×3
=7828
(14)18×125 (15)25×44 (16)42×25 (17)99×9
=(10+8)×125 =25×4×11 =2×25×21 =891
=10×125+8×125=2250 =1100 =1050
(18)99×78
=(100-1) ×78=100×78-1×78 =7722
(19)45×37+37×55 (20)28×21+28×79 (21)17×23-
23×7
=37×+(45+55) =28×(21+79) =23×(17-7)
=3700 =2800 =230
(22)38×46+64×38 (23)99×32+32 (24)
46+46×59
=38×(46+64) =32×(99+1) = 46×
(59+1)
=38×110 =3200 =2760
=38×(100+10)
=38×100+38×10
=4180
(25)167×2+167×3+167×5 (26)39×8+6×39-39×4
=167×(2+3+5) =39×(8+6-4)
=1670 =390(27)28×225-2×225-6×225 (28)(42+25)×125+(18+15)
×125
=225×(28-2-6) =125×(42+18+25+15)
=4500 =12500
( 29 ) 23×2×4+25×4×2+27×1×8+25×8×1 ( 30 )
99×22+33×34
=8×(23+25+27) =33×(66+34)
=600 =3300
(31)360÷4÷9 (32)250÷5÷2 (33)600÷12÷5
=360÷(4×9) = 250÷(5×2) =600÷(12×5)
=10 =25 =10
(34)800÷5÷8 (35)480÷5÷48 (36)240÷5÷12
=800÷8÷5 =480÷48÷5 =240÷12÷5
=20 =2 =4(37) 420÷35 (38)2400÷25 (39)7800÷12
=420÷7÷5 =2400÷5÷5 =7800÷6÷2
=12 =96 =650
( 40 ) 960×46÷48 ( 41 ) 99000÷121×11 ( 42 )
3702×38÷1234
=960÷48×46 =99000÷(121÷11) =1234×3×38÷1234
=920 =9000 =114 、
(43)640÷(16÷4) (44)1000÷(125÷4)
=640÷16×4 =1000÷125×4
=160 =32