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2^n+2^n-3×2^(n+1) =2×2^n-3×2^(n+1) =2^n-3×2^(n+1) =-2×2^(n+1) =-2^(n+2)
3の(2 m-4 n)乗=3の2 m乗を3の4 n乗で割る=【3のm乗位】の二乗を【9のn乗位】の二乗=36-4=32で割る。
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