1-(1⼀2+1⼀4+1⼀8+1⼀16+1⼀32+1⼀64+1⼀128)用巧算,该怎么计算?

2025-03-05 05:37:03
推荐回答(1个)
回答1:

1-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=1-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128-1/128)
=1-(1/2+1/4+1/8+1/16+1/32+1/64+1/64-1/128)
……
=1-(1/2+1/2-1/128)
=1-(1-1/128)
=1/128