1/2(1-1/2n+1)化简,急啊!
1个回答
1/2[1-1/(2n+1)]
=1/2[(2n+1)/(2n+1)-1/(2n+1)]
=1/2[(2n+1-1)/(2n+1)]
=1/2*2n/(2n+1)
=n/(2n+1)
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