Найдите значение выражения:
1) $(\sqrt{3})^2 - \sqrt{1,69}$;
2) $(3\sqrt{15})^2 - (15\sqrt{3})^2$;
3) $50 * (-\frac{1}{5}\sqrt{7})^2 - \frac{1}{4} * (3\sqrt{2})^2$;
4) $\sqrt{1089} - (\frac{1}{6}\sqrt{216})^2$;
5) $\frac{4}{9}\sqrt{39,69} - \frac{5}{49}\sqrt{59,29} + (-\frac{1}{5}\sqrt{75})^2$;
6) $\frac{1}{2}\sqrt{17^2 - 15^2} + (2\sqrt{5\frac{1}{2}})^2 - 0,3\sqrt{900}$.
$(\sqrt{3})^2 - \sqrt{1,69} = 3 - 1,3 = 1,7$
$(3\sqrt{15})^2 - (15\sqrt{3})^2 = 9 * 15 - 225 * 3 = 135 - 675 = -540$
$50 * (-\frac{1}{5}\sqrt{7})^2 - \frac{1}{4} * (3\sqrt{2})^2 = 50 * \frac{1}{25} * 7 - \frac{1}{4} * 9 * 2 = 2 * 7 - \frac{9}{2} = 14 - 4,5 = 9,5$
$\sqrt{1089} - (\frac{1}{6}\sqrt{216})^2 = 33 - \frac{1}{36} * 216 = 33 - 6 = 27$
$\frac{4}{9}\sqrt{39,69} - \frac{5}{49}\sqrt{59,29} + (-\frac{1}{5}\sqrt{75})^2 = \frac{4}{9} * 6,3 - \frac{5}{49} * 7,7 + \frac{1}{25} * 75 = 4 * 0,7 - \frac{5}{7} * 1,1 + 3 = 5,8 - \frac{55}{70} = 5\frac{8}{10} - \frac{55}{70} = 5\frac{56}{70} - \frac{55}{70} = 5\frac{1}{70}$
$\frac{1}{2}\sqrt{17^2 - 15^2} + (2\sqrt{5\frac{1}{2}})^2 - 0,3\sqrt{900} = \frac{1}{2}\sqrt{(17 - 15)(17 + 15)} + (2\sqrt{\frac{11}{2}})^2 - 0,3 * 30 = \frac{1}{2}\sqrt{2 * 32} + 4 * \frac{11}{2} - 9 = \frac{1}{2}\sqrt{64} + 2 * 11 - 9 = \frac{1}{2} * 8 + 22 - 9 = 4 + 13 = 17$
Пожауйста, оцените решение