Question

下面各题怎样算简便怎样算．1.25×32×0.25 9.07-22.78÷3.4 &n...

下面各题怎样算简便怎样算．1.25×32×0.25 9.07-22.78÷3.4 3.8+4.29+2.1+4.21.94×99+1.94 0.75×18÷0.15 9.8×25

Answer 1

（1）1.25×32×0.25
=1.25×8×4×0.25
=（1.25×8）×（4×0.25）
=10×1
=10；

（2）9.07-22.78÷3.4
=9.07-6.7
=2.37；

（3）3.8+4.29+2.1+4.2
=（3.8+4.2）+（4.29+2.1）
=8+6.39
=14.39；

（4）1.94×99+1.94
=1.94×（99+1）
=1.94×100
=194；

（5）0.75×18÷0.15 
=13.5÷0.15 
=90；

（6）9.8×25
=（10-0.2）×25
=10×25-0.2×25
=250-5
=245．