Решаю задания по математике.
67.
$$\frac{(2\sqrt{3})^2}{30} = \frac{4 \cdot 3}{30} = \frac{12}{30} = \frac{2}{5} = 0.4$$
68.
$$\frac{(4\sqrt{2})^2}{64} = \frac{16 \cdot 2}{64} = \frac{32}{64} = \frac{1}{2} = 0.5$$
69.
$$\frac{(2\sqrt{3})^2}{120} = \frac{4 \cdot 3}{120} = \frac{12}{120} = \frac{1}{10} = 0.1$$
70.
$$\frac{(2\sqrt{10})^2}{160} = \frac{4 \cdot 10}{160} = \frac{40}{160} = \frac{1}{4} = 0.25$$
71.
$$\frac{72}{(2\sqrt{3})^2} = \frac{72}{4 \cdot 3} = \frac{72}{12} = 6$$
72.
$$\frac{90}{(3\sqrt{5})^2} = \frac{90}{9 \cdot 5} = \frac{90}{45} = 2$$