求极限:lim(1+1/2+1/4+……+1/2的n-1次方)
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求极限:lim(1+1/2+1/4+……+1/2的n-1次方)
求极限:lim(1+1/2+1/4+……+1/2的n-1次方)
求极限:lim(1+1/2+1/4+……+1/2的n-1次方)
原式=lim(1-1/2^n)/(1-1/2)
=lim(2-1/2^(n-1))
=2
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