Question

9.89-9.89×0.89简便计算？

Answer 1

运用平方差公式
方法一：9.89-9.89×0.89 =9.89×（1-0.89） =9.89×0.11 =1.0879
方法二：9.89-9.89×0.89
=（10-0.11）-（10-0.11）×（1-0.11）
=（10-0.11）-（10-1.1-0.11+0.0121）
=10-0.11-10+1.1+0.11-0.0121
=1.1-0.0121
=1.0879

Answer 2

简便计算是直接提取公约数9.89得

9.89x(1-0.89)
=9.89x0.11
=9.89x0.1+9.89x0.01
=0.989+0.0989
=1.0879

加油！

Answer 3

9.89-9.89×0.89简便计算？
9.89-9.89×0.89
=9.89×（1-0.89）
=(10-0.11)×0.11
=1.1-0.121
=1.0879

Answer 4

简算：
9.89-9.89X0.89
=9.89X（1-0.89）
=9.89X0.11
=9.89X（0.1+0.01）
=9.89X0.1+9.89Ⅹ0.01
=0.989+0.0989
=1.0879

Answer 5

9.89-9.89×0.89
=9.89×（1-0.89）
=9.89×0.11
=9.89×（0.1+0.01）
=0.989+0.0989
=1-0.011+0.0989
=1.879
运用了乘法分配律