=2+1/2+2+1/4+2+1/8+2+1/16+2+1/32+2+1/64-13
=2*6-13+(1/2)(1-1/2^6)/(1-1/2)
=-1+63/64
=-1/64
参考公式:等比数列前n项和
Sn=a1(1-q^n)/(1-q)
5/2+9/4+17/8+33/16+65/32+129/64-13
1个回答
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