Question

х-(2х+(3.5х-4)) при х=-2/5

Answer 1

Ответ:

$5.8$

Пошаговое объяснение:

Сократим:

$x - (2x + (3.5x - 4)) = x - (2x + 3.5x - 4) = x - 2x - 3.5x + 4 = - 4.5x + 4$

х=-2/5

$- 4.5 \times ( - \frac{2}{5} ) + 4$

$- 4.5 \times ( - \frac{2}{5} ) = - 4 \frac{5}{10} \times ( - \frac{2}{5} ) = - \frac{45}{10} \times ( - \frac{2}{5} ) = - \frac{9}{5} \times ( - \frac{1}{1} ) = 1 \frac{4}{5} = 1.8$

$1.8 + 4 = 5.8$

Answer 2

х-(2х+(3.5х-4)) при х=-2/5

х-(2х+(3.5х-4))=х-(2х+3.5х-4)=х-(5,5х-4)=х-5,5х+4=-4,5х+4

при х=-2/5=-0,4

-4,5х+4=-4,5*(-0,4)+4=1,8+4=5,8

Ответ:5,8