Question

9.89×9.9+0.989的简便运算？

Answer 1

9.89*9.9+0.989=9.89*9.9+9.89*0.1=9.89*(9.9+0.1)=9.89*10=98.9

Answer 2

你好，根据你的题意，这道题我认为应该这样做最简便
9.89×9.9+0.989
=0.989x99+0.989
=0.989x（99+1）
=0.989x100
=98.9
以上仅供参考，希望能对你有所帮助

Answer 3

=0.989*10*9.9+0.989
=0.989*99+0.989
=0.989*（99+1）
=0.989*100
=98.9

Answer 4

运用的是乘法分配律，你需要把9.89转化成0.989×99。0.989×99+0.989×1＝0.989×括号里99+1括起来=0.989×100=98.9。