Question

若（x^m÷x^2n）÷x^2m-n与2x^3是同类项……

Answer 1

（x^m÷x^2n）÷x^2m-n

=x^(m-2n-2m+n)

=x^(-m-n)

与2x^3是同类项

-m-n=3

m+n=-3 (1)

m+5n=2 (2)

(2)-(1)

4n=5,n=5/4

m=-3-n=-17/4

m^2-25n=-211/16