2(1-1/2n)+1-【n+1/2n】化简,

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2(1-1/2n)+1-【n+1/2n】化简,
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2(1-1/2n)+1-【n+1/2n】化简,
2(1-1/2n)+1-【n+1/2n】化简,

2(1-1/2n)+1-【n+1/2n】化简,
2(1-1/2n)+1-(n+1/2n)=2-2/2n+1-n-1/2n=3-n-3/2n=(6n-2n^2-3)/2n

3-3/2n

2(1-1/2n)+1-【n+1/2n】=2-n+1-n-1/2n=3-2.5n

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