已经知道3^m=a,81^n=b.求:(1)3^(3m+8n) (2)3^(3m-8n)
1个回答
3^m=a,81^n=b,3^4n=b ,
(1)3^(3m+8n)=3^3m× 3^8n=a^3 b^2
(2)3^(3m-8n)=3^3m/3^8n=a^3/b^2
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