计算，能简算的要简算．1.25×2.25×0.89.7×99+9.74.8×7.8+78×0.523.65×10.1．

Question

计算，能简算的要简算．
1.25×2.25×0.8                      
9.7×99+9.7
4.8×7.8+78×0.52                    
3.65×10.1．

Answer 1

（1）1.25×2.25×0.8
=1.25×0.8×2.25
=1×2.25
=2.25；

（2）9.7×99+9.7
=9.7×（99+1）
=9.7×100
=970；

（3）4.8×7.8+78×0.52
=4.8×7.8+7.8×5.2
=（4.8+5.2）×7.8
=10×7.8
=78；

（4）3.65×10.1
=3.65×（10+0.1）
=3.65×10+3.65×0.1
=36.5+0.365
=36.865．