计算(5x^2y^2+4xy^3)÷(8xy)
计算(xy-y^2)÷x-y/xy
计算:[5xy^2(x^2-3xy)-(-3x^2y^2)^3]÷(5xy)^2
计算:{4x(2xy-3xy的平方)-3x平方y(4x-5y)}÷(-0.5xy)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
(x^2+xy/x-y)/(xy/x-y)计算
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值