-4(pq+pr)十(4pq+pr)=
问题描述:
-4(pq+pr)十(4pq+pr)=
答
=-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…