计算:1/2+1/4+1/8+1/16+1/64+1/128+1/256

问题描述:

计算:1/2+1/4+1/8+1/16+1/64+1/128+1/256

1/2+1/4=3/4
1/2+1/4+1/8=7/8
1/2+1/4+1/8+1/16=15/16
……………………………………
1/2+1/4+1/8+1/16+1/64+1/128+1/256 =255/256