化简(x^2+xy)\(x^2-xy)÷(x+y)÷(-xy)\(y^2-xy)的结果是?
(x^2-xy)y÷y-x/xy怎么做?
(xy-x^2)乘以(xy)/(x-y)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算(xy-y^2)÷x-y/xy
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(x^2+xy/x-y)/(xy/x-y)计算
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
化简:[(x+y)²-(x-y)²]÷2xy
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
已知x-xy=8,xy-y=-9,求x+y-2xy的值
(x+y-2xy)(x+y-2)+(1-xy)²