(x+y)(x-y)+(x-y)^2-(6x^2-2xy^2)÷(2y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
因式分解:x×x-xy-2y×y-x-y
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
计算:(x+y/x-y)÷(xy+x^2)
(x^2-xy)y÷y-x/xy怎么做?
(x^2+xy/x-y)/(xy/x-y)计算
(x+y)(x-y)+(x-y)^2-(6x^2-2xy^2)÷(2y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(x+y)(x-y)+(x-y)的平方-(6X的平方Y-2XY的平方)/2Y