Задача №543

Вычислите: $14\cdot {\left(-\frac{1}{7}\sqrt{15}\right)}^2-\frac{1}{8}\cdot (2\sqrt{6}{)}^2$$14\cdot {\left(-\frac{1}{7}\sqrt{15}\right)}^2-\frac{1}{8}\cdot (2\sqrt{6}{)}^2$$$14\cdot {\left(-\frac{1}{7}\sqrt{15}\right)}^2-\frac{1}{8}\cdot (2\sqrt{6}{)}^2$$