x^3-2XY+y^2-5x-1降次幂

x^3-2XY+y^2-5x-1降次幂 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² (-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)= 5x^2y/-1/2xy*3xy^2 5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）} 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 计算3xy[2xy-x(y-2)+x-1] 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6 xy^2-5x^2y+1/2xy^2+2/3x^y 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 5xy平方+3x平方y-xy平方-2x平方y-1 合并同类项 因式分解x^2y^2+x^2y+xy^2+3xy+x+y+1 5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值