-4(pq+pr)+(4pd+pr)

问题描述:

-4(pq+pr)+(4pd+pr)

-4(pq+pr)+(4pq+pr)
=-4pq+4pr+4pq+pr
=5pr(2x-3y)-(5x-y)呐?谢谢(2x-3y)-(5x-y)=2x-3y-5x+y=-3x-2y