Question

9.9×8.8+0.81的简便运算。

Answer 1

9.9x8.8+0.81＝(10-0.1)x8.8+0.81＝88-0.88+0.81＝88-(0.88-0.81)＝88-0.07＝87.93。

Answer 2

用简便方法计算
9.9×9.81
=（10-0.1）×9.81
=10×9.81-0.1×9.81
=98.1-0.981
=97.119
0.027×0.02+0.027×0.98
=0.027×（0.02+0.98）
=0.027×1
=0.027
15.8×68+32×15.8
=15.8×（68+32）
=15.8×100
=1580