\(1+\sqrt{18}+\sqrt{8}-\sqrt{50} = 1+\sqrt{9 \cdot 2}+\sqrt{4 \cdot 2}-\sqrt{25 \cdot 2} = 1+3\sqrt{2}+2\sqrt{2}-5\sqrt{2} = 1+(3+2-5)\sqrt{2} = 1+0\sqrt{2} = 1\)
Ответ: 1