Question

0.156乘以7.5加15乘以0.013加150乘以0.0009用简便方法计算

Answer 1

0.156×7.5+15×0.013+150×0.0009=0.078×15+15×0.013+15×0.009=15×（0.078+0.013+0.009）=15×0.1=1.5

Answer 2

....
0.156×7.5+15×0.013+150×0.0009
=0.156×15×0.5+15×0.013+15×0.009
=15×（0.078+0.013+0.009）
=15×0.1
=1.5
......