-4(pq+pr)十(4pq+pr)=

问题描述:

-4(pq+pr)十(4pq+pr)=

=-4pq+(-4pr)+4pq+pr
=-4pq-4pr+4pq+pr
=-3pr望采纳(2x-3y)一(5X一y)=(2x-3y)一(5X一y)=急…