要证的公式就是a^n×a^m=a^(m+n)
这个当m、n是整数的时候很简单.a^n×a^m=[a×a×a×…×a](n个)×[a×a×a×…×a](m个)
=a×a×a×…×a(n+m个)
=a^(n+m)
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