Question

Найдите значение выражения

Answer 1

$- 3 \sqrt{0.16} + 0.8 = - 3 \sqrt{(0.4) {}^{2} } + 0.8 = - 3 \times 0.4 + 0.8 = - 1.2 + 0.8 = - 0.4 \\ \frac{1}{9} ( \sqrt{18} ) {}^{2} - ( \frac{1}{2} \sqrt{28} ) {}^{2} = \frac{1}{9 } \times 18 - \frac{1}{4} \times 28 = 2 - 7 = - 5 \\ 50 ( - \frac{1}{5} \sqrt{3} ) {}^{2} = 50 \times \frac{1}{4} \times 3 = 37.5$