化简 (-3/2x²y)²(2x²-4xy+7y²) (-4x-3y²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
4X²+2XY-2Y²+4X+7Y-3化简
(-x-2y)(x²-2xy+4y²)
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=