问题标题：
1+1/4+1/16+1/64+1/256+1/10241/18+1/54+1/108+1/180+1/270+1/378+1/504+1/648+1/810+1/990
问题描述：
1+1/4+1/16+1/64+1/256+1/1024
1/18+1/54+1/108+1/180+1/270+1/378+1/504+1/648+1/810+1/990
马建回答：
设S=1+1/4+1/16+1/64+1/256+1/1024-------------------①则S/4=1/4+1/16+1/64+1/256+1/1024+1/4096--------②①-②=3S/4=1-1/4096=4095/4096所以：S=4095/4096*4/3=1365/10241/18+1/54+1/108+1/180+1/270+1/378+1/...
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