巧算 5.25/13.125/4*85.2

来源：学生作业学帮网编辑：学帮网时间：2024/06/17 10:48:29

5.25/13.125/4*85.2
=5.25÷（13.125×4）×85.2
=5.25÷52.5×85.2
=0.1×85.2
=8.52

5.25=21/4
13.125=105/8
代进去算