Найдите значение произведения.

1) а) $\sqrt{2} \cdot \sqrt{18} = \sqrt{2 \cdot 18} = \sqrt{36} = 6$ б) $\sqrt{3} \cdot \sqrt{48} = \sqrt{3 \cdot 48} = \sqrt{144} = 12$ в) $\sqrt{13} \cdot \sqrt{52} = \sqrt{13 \cdot 52} = \sqrt{13 \cdot 13 \cdot 4} = \sqrt{13^2 \cdot 2^2} = 13 \cdot 2 = 26$ г) $\sqrt{12} \cdot \sqrt{75} = \sqrt{12 \cdot 75} = \sqrt{4 \cdot 3 \cdot 3 \cdot 25} = \sqrt{2^2 \cdot 3^2 \cdot 5^2} = 2 \cdot 3 \cdot 5 = 30$ 2) а) $\sqrt{4,5} \cdot \sqrt{72} = \sqrt{4,5 \cdot 72} = \sqrt{\frac{9}{2} \cdot 72} = \sqrt{9 \cdot 36} = \sqrt{3^2 \cdot 6^2} = 3 \cdot 6 = 18$ б) $\sqrt{12,5} \cdot \sqrt{98} = \sqrt{12,5 \cdot 98} = \sqrt{\frac{25}{2} \cdot 98} = \sqrt{25 \cdot 49} = \sqrt{5^2 \cdot 7^2} = 5 \cdot 7 = 35$ в) $\sqrt{0,4} \cdot \sqrt{3,6} = \sqrt{0,4 \cdot 3,6} = \sqrt{1,44} = 1,2$ г) $\sqrt{200} \cdot \sqrt{0,18} = \sqrt{200 \cdot 0,18} = \sqrt{36} = 6$ 3) а) $\sqrt{17} \cdot \sqrt{2} \cdot \sqrt{34} = \sqrt{17 \cdot 2 \cdot 34} = \sqrt{17 \cdot 2 \cdot 17 \cdot 2} = \sqrt{17^2 \cdot 2^2} = 17 \cdot 2 = 34$ б) $\sqrt{\frac{1}{11}} \cdot \sqrt{\frac{11}{13}} \cdot \sqrt{\frac{13}{25}} = \sqrt{\frac{1}{11} \cdot \frac{11}{13} \cdot \frac{13}{25}} = \sqrt{\frac{1}{25}} = \frac{1}{5}$ в) $\sqrt{\frac{3}{7}} \cdot \sqrt{3} \cdot \sqrt{\frac{1}{7}} = \sqrt{\frac{3}{7} \cdot 3 \cdot \frac{1}{7}} = \sqrt{\frac{9}{49}} = \frac{3}{7}$