(x²-2xy+y²)+(-2x+2y)+1
(x+y-2xy)(x+y-2)+(1-xy)²
(xy-x^2)乘以(xy)/(x-y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
因式分解:x×x-xy-2y×y-x-y
计算3xy[2xy-x(y-2)+x-1]
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
x^2+y^2-x-y-xy+1如何因式分解
X平方-XY-6Y平方+2X-Y+1
(x^2-xy)y÷y-x/xy怎么做?
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)