Question

помогите люди добрые ​

Answer 1

Ответ:

$6) \frac{0.4}{1 + \frac{2}{3} } = \frac{2}{5} \div \frac{5}{3} = \frac{6}{25} = 0.24$

$7)a > \sqrt{49 } \\ a < \sqrt{64} \\ a = \sqrt{53}$

$8) \frac{ {a}^{7} \times {a}^{18} }{ {a}^{23} } = \frac{ {a}^{25} }{ {a}^{23} } = {a}^{2} = {11}^{2} = 121$