(-5X^2y)^3 ÷(-1/5xy^2)=-125x^6y^3÷-1/5xy^2=-125x^6y^3*-5/1xy^2=625x^7y^5(a-4)(1-c)+(4-a)c=-(4-a)(1-c)+(4-a)c=(4-a)c-(4-a)(1-c)第一题正确答案：625x^5y 第二题正确答案：（a-4）（1-2c）

5x^2y/-1/2xy*3xy^2 若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）} 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= (-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 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-2)-2x²y²+5(xy-y)²)÷(2xy) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] xy^2-5x^2y+1/2xy^2+2/3x^y 5xy平方+3x平方y-xy平方-2x平方y-1 合并同类项 (5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3 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