Question

计算下面各题，能简算要简算． 375+450÷18×25（115+217）×15×175.3÷43+0.75×5.7-75%1.25×3.2×2.5

计算下面各题，能简算要简算． 375+450÷18×25（115+217）×15×175.3÷43+0.75×5.7-75%1.25×3.2×2.5．

Answer 1

（1）375+450÷18×25
=375+25×25
=375+625
=1000；

（2）（

1

15

+

2

17

）×15×17
=

1

15

×15×17+

2

17

×15×17
=17+30
=47；

（3）5.3÷

4

3

+0.75×5.7-75%
=（5.3+5.7-1）×0.75
=10×0.75
=7.5；

（4）1.25×3.2×2.5
=（1.25×8）×（0.4×2.5）
=10×1
=10．