速算与巧算1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024+1/4096=答案是4093/4096

问题描述:

速算与巧算
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024+1/4096=
答案是4093/4096