=13又7/13-(4又1/4+3又7/13)-0.75=13又7/13-4又1/4-3又7/13-0.75=13又7/13-3又7/13-4又1/4-0.75=10-4又1/4-0.75=10-(4又1/4+3/4)=10-5=5望采纳……
13又7/13-(4又1/4+3又7/13)-0.75=(13又7/13-3又7/13)-(4又1/4+3/4)=10-5=5