若单项式-2/3x^3y^7-2n与单项式-4x^m+2y^2m+3的和仍是单项式,则(-m)的n+2次方=

问题描述:

若单项式-2/3x^3y^7-2n与单项式-4x^m+2y^2m+3的和仍是单项式,则(-m)的n+2次方=

单项式(-2/3)x^3y^(7-2n)与单项式-4x^m+2y^(2m+3)的和仍是单项式,则两个单项式是同类项,即:
m=3,7-2n=2m+3, n= -1
(-m)的n+2次方= (-3)的1次方= -3