Question

8.9*9.9简便计算？

请问8.9×9.9简算如何讲解

Answer 1

8.9x9.9
8.9x（10-0.1）
8.9x10-8.9x0.1
89-0.89
=88.11

Answer 2

运用乘法分配律，简便运算如下：
8.9×9.9
＝8.9×(10－0.1)
＝8.9×10－8.9×0.1
＝89－0.89
＝88.11

Answer 3

8.9*9.9
＝8.9*（10-0+1）
＝89-0.89
＝88.11

Answer 4

8.9×9.9
=8.9×（10-0.1）
=8.9×10-8.9×0.1
=89-0.89
=88.11

Answer 5

8.9×9.9
=8.9×（10-0.1)
=8.9×10-8.9×0.1
=89-0.89
=88.11