Question

помогите пожалуйста ​

Answer 1

$- 2 \frac{2}{5} x \times \frac{3}{7} y = - \frac{12 \times 3}{5 \times 7} xy = \\ - \frac{12 \times 3}{5 \times 7} \times ( - 7) \times 1 \frac{1}{4} = \\ \frac{12 \times 3 \times 7 \times 5}{5 \times 7 \times 4 } = 3 \times 3 = 9$