5x²+6xy-8y² 化简
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
计算:(xy-x²)×x-y/xy
怎样因式分解5x²+6xy-8y²-3x+8y-2
急用4x²-4xy-8y²-8x²+10y+3还有5x²+17xy+6y
x²/xy-x/y
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²
化简2XY+(X-Y)²