Question

已知,9a^n-3b^2n与-2a^3mb^5-n的积与5a^4b^9是同类项,求m,n

Answer 1

(9a^n-3b^2n)*(-2a^3mb^5-n)=-18a^3m+n-3 b^5+n与5a^4b^9是同类项得

5+n=9,

3m+n-3=4 解方程组得n=4,m=1.