x^2-xy-2y^2-x-7y-6
=(x-2y)(x+y)-(x+7y)-6
=[(x-2y)-3][(x+y)+2]
=(x-2y-3)(x+y+2)
m=-3,n=2
若x^2-xy-2y^2-x-7y-6=(x-2y+m)(x+y+n) 求:m,n
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