计算:4x^2-4xy+y^2/2x+y/(4x^2-y^2)4x^2-4xy+y^2/2x+y÷(4x^2-y^2)

计算:2xy/(x+y)².(x+y)/4y 计算：[(x-y)^2-(x+y)^2]/(-4xy)= 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 （x^2+xy/x-y)/（xy/x-y)计算 计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2 计算[4/(x^2-y^2)+(x+y)/(xy^2-x^2y)]除[(x+2y)(x-y)/(x^2+2xy^2)分式计算 x-y/xy-y^2计算 计算:(x-2y)(1+x+2y+4y^2+2xy+x^2) 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy) 计算x²y³-2x(4xy³) 计算:12xy^2/(x+y) * (x^2 - y^2)/4xy 计算-（x²y+3xy-4）+3（x²y-xy+2） 计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 计算(-xy)(x+2x²y) 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy 计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2)