计算:-x^5y^3/2xy^2

计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 计算：3xy[2xy-x（y-2）+x] 计算3xy[2xy-x(y-2)+x-1] （x^2+xy/x-y)/（xy/x-y)计算 计算5x^3y*(-3y)^2+(-6xy)^2*(-xy)-xy^3(-4x)^2 计算:-x^5y^3/2xy^2 (3x-y)^2+(2x+3y)(-2x-3y)+5xy 计算急 计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x） x-y/xy-y^2计算 计算:x²y-（2xy²-5x²y）+3xy²-y³ 计算：[5xy^2(x^2-3xy)-(-3x^2y^2)^3]÷(5xy)^2 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 [5xy^2(x^2-3xy)-(-3x^2y^2)^3]/5x^2y^2 计算. 计算：(5xy^2(x^2-3xy)-(-3x^2y)^2)/2x^2y^2 计算(-xy)(x+2x²y) 计算:(x^2-2xy)/(x^2-3xy+2y^2)-(xy+y^2)/(x^2-y^2) 计算(5x^2y^2+4xy^3)÷(8xy)