若(am+1bn+2)(a2n-1b2n)=a5b3,则求m+n的值.

问题描述:

若(am+1bn+2)(a2n-1b2n)=a5b3,则求m+n的值.

(am+1bn+2)(a2n-1b2n)=am+1×a2n-1×bn+2×b2n
=am+1+2n-1×bn+2+2n
=am+2nb3n+2=a5b3
∴m+2n=5,3n+2=3,解得:n=

1
3
,m=
13
3

m+n=
14
3

答案解析:首先合并同类项,根据同底数幂相乘,底数不变,指数相加的法则即可得出答案.
考试点:同底数幂的乘法.
知识点:本题考查了同底数幂的乘法,难度不大,关键是掌握同底数幂相乘,底数不变,指数相加.