1+1/2+3/4+7/8+15/16+.511/512
问题描述:
1+1/2+3/4+7/8+15/16+.511/512
答
原式=1+1-1/2+1-1/4+1-1/8+……+1-1/(2^9)
=10-(1/2+1/4+……+1/2^9)
=10+1-1/2^9
=11-1/512
=10又511/512