1/2+1/4+1/8+1/16+.+1/512

问题描述:

1/2+1/4+1/8+1/16+.+1/512

1/2+1/4+1/8+1/16+.+1/512
=1/2+1/2-1/4+1/4-1/8.+1/256-1/512
=1/2+1/2-1/512
=511/512