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简介:
1.283+52+117+148
=(283+117)+(52+48)
=400+100
=500
(运用加法交换律和结合律)
2.195-(95+24)
=195-95-24
=100-24
=76
(运用减法性质)
3.(0.75+125)×8
=0.75×8+125×8
=6+1000
=1006
(运用乘法分配律)
4.(125-0.25)×8
=125×8-0.25×8
=1000-2
=998
(运用乘法分配律)
5.(1.125-0.75)÷0.25
=1.125÷0.25-0.75÷0.25
=4.5-3
=1.5
(运用除法性质)
6.(450+81)÷9
=450÷9+81÷9
=50+9
=59
(运用除法性质,相当乘法分配律)
7.375÷(125÷0.5)
=375÷125×0.5
=3×0.5
=1.5
(运用除法性质)
8.4.2÷(0.6×0.35)
=4.2÷0.6÷0.35
=7÷0.35
=20
(运用除法性质)
9.12×125×0.25×8
=(125×8)×(12×0.25)
=1000×3
=3000
(运用乘法交换律和结合律)
10.(48×25×3)÷8
=48÷8×25×3
=6×25×3
=450
(运用除法性质,相当加法性质)