Question

计算下面各题．（能简便的要用简便方法计算）2.3+3.91÷（22-19.7）21.6÷[64.8-（48.6-2.7×2）]0.25×0

计算下面各题．（能简便的要用简便方法计算）2.3+3.91÷（22-19.7）21.6÷[64.8-（48.6-2.7×2）]0.25×0.03×4 0.13×3.89+0.13×5.11 10.1×87．

Answer 1

（1）2.3+3.91÷（22-19.7）
=2.3+3.91÷2.3
=2.3+1.7
=4

（2）21.6÷[64.8-（48.6-2.7×2）]
=21.6÷[64.8-（48.6-5.4）]
=21.6÷[64.8-43.2]
=21.6÷21.6
=1

（3）0.25×0.03×4 
=（0.25×4）×0.03
=1×0.03
=0.03

0.13×3.89+0.13×5.11     
=0.13×（3.89+5.11）
=0.13×9
=1.17

（5）10.1×87
=（10+0.1）×87
=10×87+0.1×87
=870+8.7
=878.7