8.85×9.8+0.885+0.885 =?簡便計算

8.85×9.8+0.885+0.885 =?簡便計算


8.85×9.8+0.885+0.885
=0.885×98+0.885+0.885
=0.885×(98+1+1)
=0.885×100
=88.5