怎样简便就怎样计算355+260+140+245 102×99 32×...
答案:2 悬赏:30 手机版
解决时间 2021-04-11 16:49
- 提问者网友:杀手的诗
- 2021-04-11 11:42
怎样简便就怎样计算355+260+140+245 102×99 32×125 645-180-245 382×101-382 4×60×50×8.
最佳答案
- 五星知识达人网友:话散在刀尖上
- 2021-04-11 12:03
(1)355+260+140+245
=(355+245)+(260+140)
=600+400
=1000
(2)99×21
=(100-1)×21
=100×21-21
=2100-21
=2079
(3)48×125
=6×8×125
=6×(8×125)
=6×1000
=6000
(4)645-180-245
=(645-245)-180
=400-180
=220
(5)38×99+38
=38×(99+1)
=38×100
=3800
(6)3500÷14÷5
=3500÷(14×5)
=3500÷70
=50
(7)17×23-23×17
=17×(23-23)
=17×0
=17
(8)50×25×20×40
=(50×20)×(25×40)
=1000×1000
=1000000
(9)29×8+12×29+76
=29×(8+12)+76
=29×20+76
=580+76
=656
=(355+245)+(260+140)
=600+400
=1000
(2)99×21
=(100-1)×21
=100×21-21
=2100-21
=2079
(3)48×125
=6×8×125
=6×(8×125)
=6×1000
=6000
(4)645-180-245
=(645-245)-180
=400-180
=220
(5)38×99+38
=38×(99+1)
=38×100
=3800
(6)3500÷14÷5
=3500÷(14×5)
=3500÷70
=50
(7)17×23-23×17
=17×(23-23)
=17×0
=17
(8)50×25×20×40
=(50×20)×(25×40)
=1000×1000
=1000000
(9)29×8+12×29+76
=29×(8+12)+76
=29×20+76
=580+76
=656
全部回答
- 1楼网友:你可爱的野爹
- 2021-04-11 12:15
(1)355+260+140+245
=(355+245)+(260+140)
=600+400
=1000
(2)102×99
=(100+2)×99
=100×99+2×(100-1)
=9900+200-2
=10098
(3)32×125
=4×(8×125)
=4×1000
=4000
(4)645-180-245
=645-245-180
=400-180
=220
(5)382×101-382
=382×(101-1)
=382×100
=38200
(6)4×60×50×8
=(4×50)×(60×8)
=200×480
=96000
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