简算1x1⼀2+1⼀2x1⼀3.........1⼀99x1⼀100

要方法
2025-03-07 03:45:37
推荐回答(1个)
回答1:

1x1/2+1/2x1/3.........1/99x1/100
=1-1/2+1/2-1/3+...+1/99-1/100
=1-1/100
=99/100