8x^2y^2-4x^3y-2xy怎么进行因式分解

x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x^2-xy)y÷y-x/xy怎么做? 已知x+y=-1求：x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值.x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4 ①=(x+y)(x^3+4x^2y+xy+4xy^2+y^3) ②从第①步到第②步是怎么做的? 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 8x^2y^2-4x^3y-2xy怎么进行因式分解 dy/dx=(xy+3x-y-3)/(xy-2x+4y-8) 微分方程怎么求呀,求教, 化简2(x²y+xy)-3(x²y-xy)-4x²y (x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 x平方-2xy-3y平方+8y-4 （-3x^y+2xy)-( )=4x^+xy x²y+2xy-3y怎么化简 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²