与式≦(分子)log(3^n+3^n)=n(log2)+n
ゆえに与式≦log2(分子分母を約分して)
同様に
(分子)log(2^n+2^n)=(n+1)log2≦与式
左辺全体は
log2+(1/n)(log2)→log2
はさみうちの原理より求める極限は
log2(底は３)
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