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