若(x+m)(x-5)=x^2-2x+3n,则m-n=
1个回答
(x+m)(x-5)=x^2-2x+3n
x²+(m-5)x-5m=x^2-2x+3n
所以:m-5=-2
-5m=3n
m=3
n=-5
m-n=3-(-5)=8
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