Question

Пжл, номер 7.12(1,3)

Answer 1

1) ${7}^{ - 2} x = 21 + {3}^{ - 1} \\ \frac{1}{ \frac{1}{7} } x = 21 \times \frac{1}{3} \\ \frac{3}{ \frac{1}{7} } x = 64 \\ 3x = 448 \\ x = 149 \frac{1}{3}$
3) ${\frac{3 \times {3}{-2} } x = {2}{2} \times 3 \\ {\frac{3}{2}} x = 12 \\ x = {\frac {24}{3}} \\ x = 8$ .