1/2+1/4+1/8+1/16+...+1/1024
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1/2+1/4+1/8+1/16+...+1/1024
1/2+1/4+1/8+1/16+...+1/1024
1/2+1/4+1/8+1/16+...+1/1024
1/2+1/4+1/8+1/16+...+1/1024为一个等比数列的和,
Sn=[A1(1-q^n)]/(1-q)
=1/2(1-1/2^10) /1- 1/2
=1-1/2^10
=1023/1024
0.5*(1-0.5^10)/(1-0.5).....你到网上查查"等比数列"...会很详细的..