1/2+1/4+1/8+1/16+1/32+1/64+.+1024=?
问题描述：
1/2+1/4+1/8+1/16+1/32+1/64+.+1024=?
答
1-1/2+1/2-1/4+1/4-1/8+.+1/512-1/1024
=1-1/1024
=1023/1024