化简;-3a+2b-(a-3b); 2(2X-3Y)-4(3/4x-2y+1)

问题描述:

化简;-3a+2b-(a-3b); 2(2X-3Y)-4(3/4x-2y+1)

-3a+2b-(a-3b)=-3a+2b-a+3b=-4a+5b
2(2X-3Y)-4(3/4x-2y+1)=4X-6Y-3X+8Y-4=X+2Y-4