Question

1) -15а², якщо а=2\5

Answer 1

Ответ:

$- 15 \times ( \frac{2}{5} ) {}^{2} = - 15 \times \frac{4}{25} = - \frac{12}{5} = \\ = - 2 \frac{2}{5}$

Answer 2

Ответ:

-15×(2/5)² =-15×4/25 = -3 ×4/5 = -12/5= -2 2/5