巧算 5.25/13.125/4*85.2

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巧算5.25/13.125/4*85.2巧算5.25/13.125/4*85.2巧算5.25/13.125/4*85.25.25/13.125/4*85.2=5.25÷(13.125×4)×85.2=

巧算 5.25/13.125/4*85.2
巧算 5.25/13.125/4*85.2

巧算 5.25/13.125/4*85.2
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