1⼀5+1⼀10+1⼀20+1⼀40+......+1⼀1280

2025-02-23 05:48:06
推荐回答(2个)
回答1:

=1/5(1+1/2+1/4+1/8+...+1/256)=1/5(2-1/256)=511/1280

回答2:

应该是511/1280