5×x−1+2×5−x≤52+(2)2×(x−1)2+(5−x)25\times\sqrt{x-1}+ \sqrt{2} \times \sqrt{5-x} \leq \sqrt{5^2+(\sqrt{2})^2} \times \sqrt{(\sqrt{x-1})^2+(\sqrt{5-x})^2}5×x−1+2×5−x≤52+(2)2×(x−1)2+(5−x)2
