5又4分之3*0.4+5分之2*4.25

问题描述:

5又4分之3*0.4+5分之2*4.25

5又4分之3*0.4+5分之2*4.25
=5.75*2/5+2/5*4.25
=2/5*(5.75+4.25)
=2/5*10
=4