Question

срочно очень при очень​

Answer 1

${( {x}^{7} {y}^{4} )}^{3} \div {( {x}^{10} {y}^{5} )}^{2} = {x}^{7 \times 3} {y}^{4 \times 3} \div {x}^{10 \times 2} {y}^{5 \times 2} = {x}^{21} {y}^{12} \div {x}^{20} {y}^{10} = {x}^{21 - 20} {y}^{12 - 10} = {x}^{1} {y}^{2} = x {y}^{2}$

$x {y}^{2} = ( - 3) \times {( \frac{2}{3} )}^{2} = (- 3) \times \frac{4}{9} = \frac{ - 3 \times 4}{9} = - \frac{12}{9} = - \frac{4}{3}$

Ответ: - 4/3