你是不是少输了一项,原题是不是:
|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+...+|1/10-1/9|
=1/2-1/3+1/3-1/4+1/4-1/5...+1/9-1/10
=1/2-1/10
=2/5
欢迎向数学爱好者团队提问,不会还可以再问我,希望采纳,O(∩_∩)O谢谢!
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1/2-1/3+1/3-1/4+1/4.......+1/9-1/10
=1/2-1/10
=2/5
因为 1/2 > 1/3 > 1/4 > 1/5 > 1/6 > 1/7 > 1/8 > 1/9 > 1/10
所以原式=-(1/3-1/2)-(1/4-1/3)-(1/6-1/5)-...-(1/10-1/9)
=1/2-1/3+1/3-1/4+1/4.......+1/9-1/10
=1/2-1/10
=2/5