1⼀2+3⼀4+7⼀8+15⼀16+31⼀32=63⼀64+127⼀128+255⼀256 要过程喔

2024年11月19日 03:34
有2个网友回答
网友(1):

解:原式=1-1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/64+1-1/128+1-1/256
=8-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256)
期中1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
=1/2+1/4+1/8+1/16+1/32+1/64+1/128+(1/256+1/256)-1/256
=1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128-1/256
……
=1-1/256
所以原式=8-(1-1/256)=7+1/256

网友(2):

(1-1/2)+(1-1/4)+(1-1/8)+ +(1-1/256)=
8-(1/2+1/4+ +(1/2)^8)=8-(1-1/256)=7+1/256
7又256分之1