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) ${frac{3 times {3}{-2} } x = {2}{2} times 3 \ {frac{3}{2}} x = 12 \ x = {frac {24}{3}} \ x = 8$ .