`Cho` `A=frac{1}{101}+frac{1}{102}+frac{1}{103}+...+frac{1}{200}.``Chứng` $minh:$ `a.` `A>frac{1}{2}` `b.` `A>frac{7}{12}` `c.` `A>frac{5}{8}`

2025-02-13 07:59:07

`Cho` `A=\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+...+\frac{1}{200}.``Chứng` $minh:$ `a.` `A>\frac{1}{2}` `b.` `A>\frac{7}{12}` `c.` `A>\frac{5}{8}`

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