题目内容
a2n÷________=am+n.
an-m
若(am+1bm+2)·(a2n-1b2n)=a5b5,求m+n.
(am+n)3÷a3m·a2n=________.
am=2,an=7,则am+n=________,a2n=________,am-n=________.