Question

9.9*18+1.8的简便计算？

Answer 1

计算如下：
9.9*18+1.8
=9.9*18+18*0.1
=18*(9.9+0.1)
=18*10
=180

Answer 2

简便计算看到9.9这种就要先办法凑成整数，9.9+0.1=10，刚好后面是“+”。
9.9×18+1.8
=9.9×18+0.1×18
=（9.9+0.1）×18 乘法分配律
=10×18
=180

Answer 3

等于1.8乘以（99+1）=1.8乘以100

Answer 4

=（99+1）*1.8=100*1.8=180