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maiv5348
2 năm trước
`K=\frac{5}{1.2.3}` `+` `\frac{8}{2.3.4}` `+` `\frac{11}{3.4.5}+...+``\frac{6056} S{2018.2019.2020}` . `So ` `sánh ` `K` `với` `2`
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