作业帮1024+512+256+.+2+1+2/1+4/1+8/1+.512/1+1024/1
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1024+512+256+.+2+1+2/1+4/1+8/1+.512/1+1024/1
1024+512+256+.+2+1+2/1+4/1+8/1+.512/1+1024/1
1024+512+256+.+2+1+2/1+4/1+8/1+.512/1+1024/1
1、显然是等比数列的和：Sn=a1(1-q^n)/(1-q) (q不等于0)
2、这题有错误吧?应该是1024+512+256+.+2+1+1/2+1/4+1/8+.1/512+1/1024
=2^-10*(1-2^21)/(1-2)≈2048
3、原题=2*(2^10+2^9+...+2^1)+2^0=2*(2*(1-2^10)/(1-2))+1=4093