(X^n)[y^(n-1)]+(m-2n)是关于x的五次单项式,m=____n=_____2a^3b^n与-2a^mb是同类项,m+n=_____4x^2+bX+c与12+6X^2-X是;两个相等整式,a=_____b=____c=______

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