Question

РЕШИТЕ ПОЖАЛУЙСТА
2/3(10с)=-8
2t=1 1/3(t+5)
1 1/4(x-2)=-5(x+1)

Это 7 класс Алгебра Дрофеев №389(г,д,е)

Answer 1

$frac{2}{3} (10c) = - 8 \ \ frac{20}{3} c = - 8 \ \ c = - 8 div frac{20}{3} \ \ x = - frac{5}{6}$


$2t = 1 frac{1}{3} (t + 5) \ \ 2t = 1 frac{1}{3} t + 6 frac{1}{3} \ \ 2t - 1 frac{1}{3} t = 6 frac{1}{3} \ \ frac{2}{3} t = 6 frac{1}{3} \ \ t = 6frac{1}{3} div frac{2}{3} \ \ t = 9 frac{1}{2} \ \ t = 9.5$



$1 frac{1}{4} (x - 2) = - 5(x + 1) \ \ 1 frac{1}{4} x - 2 frac{1}{2} = - 5x - 5 \ \ 1 frac{1}{4} x + 5x = - 5 + 2 frac{1}{2} \ \ 6 .25x = - 2.5 \ \ x = - 2.5 div 6.25 \ \ x = - 0.4$