x^2-xy-2y^2-x-y=?.
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f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
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X-Y/2X+2Y XY/X+Y²
因式分解:x×x-xy-2y×y-x-y