\(T=\frac{1}{\sqrt{2}}\left(\sqrt{4x^2-4x+10}+\sqrt{4x^2-8x+8}\right)\)
\(T=\frac{1}{\sqrt{2}}\left(\sqrt{\left(2x-1\right)^2+3^2}+\sqrt{\left(2-2x\right)^2+2^2}\right)\)
\(T\ge\frac{1}{\sqrt{2}}\sqrt{\left(2x-1+2-2x\right)^2+\left(3+2\right)^2}=\sqrt{13}\)
Hình như bạn ghi sai đề :)