化简各项4(-xy+2y)-3(2x-xy)我会算,但是不敢肯定,

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• 化简各项4(-xy+2y)-3(2x-xy)
• 化简各项4(-xy+2y)-3(2x-xy)我会算,但是不敢肯定,
• 化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1
• 化简[X(X^2Y^2-XY)-Y(X^2-2X^3Y)]/X^2Y