7) √5 ⋅ √18 ⋅ √10 =

7) $$\sqrt{5} \cdot \sqrt{18} \cdot \sqrt{10} = \sqrt{5 \cdot 18 \cdot 10} = \sqrt{5 \cdot 2 \cdot 9 \cdot 10} = \sqrt{10 \cdot 9 \cdot 10} = \sqrt{9 \cdot 100} = \sqrt{9} \cdot \sqrt{100} = 3 \cdot 10 = 30$$

Ответ: 30