解
1/2-(1/2-1/4)-(1/4-1/8)-(1/8-1/16)-(1/16-1/32)-(1/32-1/64)
=1/2-1/2+1/4-1/4+1/8-1/8+1/16-1/16+1/32-1/32+1/64——前面抵消了
=1/64