Tìm x biết ​\(x \in BC\left( {26;39;260} \right),2000 jwplay...

* Hướng dẫn giải

 \(\begin{array}{l} 26 = 2.13\\ 39 = 3.13\\ 260 = {2^2}.5.13\\ \Rightarrow BCNN\left( {26;39;260} \right) = {2^2}.3.5.13 = 780\\ \Rightarrow BC\left( {26;39;260} \right) = B\left( {780} \right) = \left\{ {0;780;1560;2340;3120;...} \right\}\\ ma\,\,2000 < x < 3000 \Rightarrow x = 2340 \end{array} \)