1.8×7/9÷7/9×1.8

=1.8×1.8×(7/9÷7/9)

=1.8×(2-0.2)

=1.8×2-1.8×0.2

=3.6-0.36

=3.24

8.46乘以99 8点46用简便方法怎么计算

8.46乘以99 8点46用简便方法怎么计算

8.46乘以99 8点46

=8.46*（99 1）

=8.46*100

=846

1.25乘以八点八简便运算

11

解析：

1.25×8.8

=1.25×(0.8×11)

=(1.25×0.8)×11

=1×11

=11