Question

решите пожалуйста задание №6

Answer 1

а)
$9 - (8.4 - x) = - 2 \ 8.4 - x = 9 + 2 \ 8.4 - x = 11 \ x = 8.4 - 11 = - 2.6$
б)
$5 frac{5}{12} + a = - 3 frac{1}{3} \ a = - 3 frac{1}{3} - 5 frac{5}{12} = - frac{10}{3} - frac{65}{12} = - frac{ 40}{12} - frac{65}{12} = - frac{105}{12} = - frac{35}{4} = - 8 frac{3}{4} = - 8.75$
в)
$2(x - 8) = - 3(x + 2) \ 2x - 16 = - 3 x - 6 \ 2x + 3x = - 6 + 16 \ 5x = 10 \ x = 2$
г)
$5(4 - 3x) - 4(7 - 4x) = 1.3 \ 20 - 15x - 28 + 16x = 1.3 \ x - 8 = 1.3 \ x = 1.3 + 8 = 9.3$
д)
$6.4(2 - 3y) = 6(0.8y - 1) + 6.8 \ 12.8 - 19.2y = 4.8y - 6 + 6.8 \ - 19.2y - 4.8y = 0.8 - 12.8 \ - 24y = - 12 \ y = frac{ - 12}{ - 24} = frac{1}{2}$
е)
$frac{x - 2}{8} = frac{1}{5} \ 5(x - 2) = 8 \ 5x - 10 = 8 \ 5x = 8 + 10 \ 5x = 18 \ x = frac{18}{5} = 3.6$