1⼀2+1⼀6+1⼀12+1⼀24+1⼀48+1⼀56

2024-12-20 21:48:49
推荐回答(1个)
回答1:

1/2+1/6+1/12+1/24+1/48+1/56
=1/(1×2)+1/(2×3)+...+1/(7×8)
=1-1/2+1/2-1/3+...+1/7-1/8
=1-1/8
=7/8