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计算:4×2^(n+2)-2×2^(n+1)
人气:269 ℃ 时间:2020-10-01 21:37:22
解答
4×2^(n+2)-2×2^(n+1)
=4×2^(n+2)-2^(1+n+1)
=4×2^(n+2)-2^(n+2)
=2^(n+2)(4-1)
=3×2^(n+2)
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