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怎样简便就怎样计算.355+260+140+24599×2148×125645-180-24538×99+383500÷14÷517×23-23×1750×25×20×4029×8+12×29+76.

题目详情
怎样简便就怎样计算.
355+260+140+245             99×21              48×125
645-180-245               38×99+38            3500÷14÷5
17×23-23×17           50×25×20×40          29×8+12×29+76.

355+260+140+245             99×21              48×125
645-180-245               38×99+38            3500÷14÷5
17×23-23×17           50×25×20×40          29×8+12×29+76.
355+260+140+245             99×21              48×125355+260+140+245            99×21             48×125 645-180-245               38×99+38            3500÷14÷5645-180-245              38×99+38           3500÷14÷5 17×23-23×17           50×25×20×40          29×8+12×29+76.17×23-23×17          50×25×20×40         29×8+12×29+76.
▼优质解答
答案和解析
(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