1×2负1次方＋1×2负2次方＋1×2负3次方＋0×2负4次方＋0×2负5次方＋1×2负6次方=?

1×2负1次方＋1×2负2次方＋1×2负3次方＋0×2负4次方＋0×2负5次方＋1×2负6次方
=1/2+1/4+1/8+0+0+1/64
=(1-1/2)+(1/2-1/4)+(1/4-1/8)+0+0+1/64
=1-1/8+1/64
=7/8+1/64
=(56+1)/64
=57/64
如果原题改为：
1×2负1次方＋1×2负2次方＋1×2负3次方＋1×2负4次方＋1×2负5次方＋1×2负6次方
=1/2+1/4+1/8+1/16+1/32+1/64
=(1-1/2)+(1/2-1/4)+(1/4-1/8)+(1/8-1/316)+(1/16-1/32)+(1/32-1/64)
=1-1/64
=63/64