八分之五*5.3+5.7*八分之五-0.625

问题描述:

八分之五*5.3+5.7*八分之五-0.625

八分之五*5.3+5.7*八分之五-0.625
=八分之五*5.3+5.7*八分之五-八分之五
=八分之五*(5.3+5.7-1)
=八分之五*10
=6.25