Question

Помогите
Упростить выражения
1. 2 2/5*b*(-5/12)=
2. -18/25*x*(-2,5)=
3. 2,4*(-2/3)³*3
Даю 20б

Answer 1

Ответ:

$2 \frac{2}{5} \times b \times ( - \frac{5}{12} ) = \frac{12}{5} \times b \times ( - \frac{5}{12} ) = - b$

$- \frac{18}{25 } \times x \times ( - \frac{5}{2} ) = \frac{9}{5} x = 1 \frac{4}{5} x$

$\frac{12}{5} \times {( - \frac{2}{3} )}^{3} \times 3 = - \frac{12}{5} \times \frac{8}{27} \times 3 = \frac{24 \times 8}{5 \times 27} = \frac{8 \times 8}{5 \times 9} = \frac{64}{45} = 1 \frac{ 19}{45}$