化简(3/2x²+xy-3/5y²)×(-4/3x²y²)
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
化简 3x²+4xy+y²-2xy-3y²+5x²+7;
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
化简-3x²y+2x²y+3xy²-2xy²