（a^m+1bⁿ⁺²）（a^2n-1b²ⁿ）=a^m+1×a^2n-1×bⁿ⁺²×b²ⁿ

=a^m+1+2n-1×bⁿ⁺²⁺²ⁿ

=a^m+2nb³ⁿ⁺²=a⁵b³．

∴m+2n=5，3n+2=3，解得：n=

m+n=