Question

решите пж даму 5 баллов​

Answer 1

Решение.

1 способ.

$\bf \bigg(\dfrac{5}{8} x-\dfrac{1}{5} \bigg) * \dfrac{3}{4} = \dfrac{3}{4}$

$\bf \dfrac{5}{8} x-\dfrac{1}{5} = \dfrac{3}{4} :\dfrac{3}{4}$

$\bf \dfrac{5}{8} x-\dfrac{1}{5} = \dfrac{3}{4} *\dfrac{4}{3}$

$\bf \dfrac{5}{8} x-\dfrac{1}{5} = 1 \bigg| * 40$

$\bf 25x - 8 = 40$

$\bf 25x= 40 + 8$

$\bf 25x = 48$

$\bf x = \dfrac{48}{25}$

$\bf x = 1\dfrac{23}{25}$

$\bf x = 1,92$

2 способ.

$\bf \bigg(\dfrac{5}{8} x-\dfrac{1}{5} \bigg) * \dfrac{3}{4} = \dfrac{3}{4}$

$\bf \dfrac{5}{8} x * \dfrac{3}{4} - \dfrac{1}{5} * \dfrac{3}{4} = \dfrac{3}{4}$

$\bf \dfrac{15}{32} x- \dfrac{3}{20} = \dfrac{3}{4} \bigg|*160$

$\bf 75x-24 = 120$

$\bf 75x=120+24$

$\bf75x=144$

$\bf x = \dfrac{144}{75}$

$\bf x = \dfrac{48}{25}$

$\bf x = 1\dfrac{23}{25}$

$\bf x = 1,92$

Ответ: $\bf x = 1,92$.