x2+x+y2-y-2xy=?
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x2+x+y2-y-2xy=?x2+x+y2-y-2xy=?x2+x+y2-y-2xy=?x^2+x+y^2-y-2xy=x^2-2xy+y^2+x-y=(x-y)^2+(x-y)=(x-y)(x-y
x2+x+y2-y-2xy=?
x2+x+y2-y-2xy=?
x2+x+y2-y-2xy=?
x^2+x+y^2-y-2xy=x^2-2xy+y^2+x-y=(x-y)^2+(x-y)=(x-y)(x-y+1)
=x²-2xy+y²+x-y
=(x-y)²+(x-y)
=(x-y)(x-y+1)
=x2-2xy+y2+x-y
=(x-y)2+(x-y)
=(x-y)*(x-y+1)
(X-Y)(X-Y+1)
是化简吗
=(x2+y2-2xy)+(x-y)
=(x-y)2+(x-y)
=(x-y)(x-y+1)
x2+x+y2-y-2xy=?
已知x2+xy-2y2=0(y≠0),那么x/y=
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