Вычеслить надо ))))))))

Решите задачу:

$a)\frac{1}{2} \times \sqrt{144 } - 2.5 \times \sqrt{0.81} = \\ \frac{1}{2} \times 12 - 2.5 \times 0.9 = \\ 6 - 2.25 = 3.75$
$b)3.2 \times \sqrt{ \frac{25}{16} } - 5 = \\ 3.2 \times \frac{5}{4} - 5 = 0.8 \times 5 - 5 \\ = 4 - 5 = - 1$
$c)14 \sqrt{3} - 2 \sqrt{27} - 5 \sqrt{75} = \\ 14 \sqrt{3} - 2 \sqrt{9 \times 3} - 5 \sqrt{25 \times 3} = \\ 14 \sqrt{3} - 2 \times 3 \sqrt{3} - 5 \times 5 \sqrt{3 = } \\ 14 \sqrt{3} - 6 \sqrt{3} - 25 \sqrt{3} = - 17 \sqrt{3}$
$g) \sqrt{5} (2 \sqrt{5} - \sqrt{20}) = \\ \sqrt{5} \times 2 \sqrt{5} - \sqrt{5} \times \sqrt{20} = \\ 2 \sqrt{25} - \sqrt{100} = 2 \times 5 - 10 = 0$