5x^2(-3y)^2+(-4xy^2)(-x^2y)化简谢谢!万分滴感谢,急,

化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2求 5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简） 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) (-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6 x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2