(o.625+0.325除以8分之3)除以4分之13

问题描述:

(o.625+0.325除以8分之3)除以4分之13

[0.625+0.325/(3/8)]/(13/4)
=[5/8+(13/40)*(8/3)]*(4/13)
=(5/8+13/15)*(4/13)
=(5/8)*(4/13)+(13/15)*(4/13)
=5/26+4/15
=179/390