Question

Помогите решить уравнения пожалуйста!!! Буду очень благодарен!!!!

Answer 1

а)
$1.5x + 4 = 0.3x - 2 \ 1.5x - 0.3x = - 2 - 4 \ 1.2x = - 6 \ x = frac{ - 6}{1.2} = - 6 div frac{12}{10} = - 6 times frac{10}{12} = - 5$
б)
$3(2x - 9) = 4(x - 4) \ 6x - 27 = 4x - 16 \ 6x - 4x = - 16 + 27 \ 2x = 11 \ x = frac{11}{2} = 5 frac{1}{2}$
в)
$7x - (3 + 2x) = x - 9 \ 7x - 3 - 2x = x - 9 \ 5x - 3 = x - 9 \ 5x - x = - 9 + 3 \ 4x = - 6 \ x = - frac{6}{4} = - frac{3}{2} = - 1.5$
г)
$5 - frac{x + 7}{6} = frac{1 0 - 2x}{3} \ frac{30}{6} - frac{x + 7}{6} = frac{2(1 0 - 2x)}{6} \ 30 - (x + 7) = 2(10 - 2x) \ 30 - x - 7 = 20 - 4x \ - x + 4x = 20 - 30 + 7 \ 3x = - 3 \ x = - 1$
д)
$3 - 2.6x = 5x + 1.48 \ - 2.6x - 5x = 1.48 - 3 \ - 7.6x = - 1.52 \ x = frac{ - 1.52}{ - 7.6} = frac{152}{100} div frac{76}{10} = frac{152}{100} times frac{10}{76} = frac{2}{10} = 0.2$
е)
$1.6(x + 5) = 4(4.5 - 0.6x) \ 1.6x + 8 = 18 - 2.4x \ 1.6x + 2.4x = 18 -8 \ 4x = 10 \ x = frac{10}{4} = 2.5$
ж)
$9x - (6x + 2.5) = - (x - 5.5) \ 9x - 6x - 2.5 = - x + 5.5 \ 3x - 2.5 = - x + 5.5 \ 3x + x = 5.5 + 2.5 \ 4x = 8 \ x = 2$
з)
$frac{3}{8} x - frac{5}{6} = frac{7}{12} x - frac{2}{3} \ frac{9x}{24} - frac{20}{ 24} = frac{14x}{24} - frac{16}{24} \ 9x - 20 = 14x - 16 \ 9x - 14x = - 16 + 20 \ - 5x = 4 \ x = - frac{4}{5} = - 0.8$
и)
$frac{7}{20} x + frac{5}{12} = frac{2}{3} - frac{1}{5} x \ frac{21x}{60} + frac{25}{60} = frac{40}{60} - frac{12x}{60} \ 21x + 25 = 40 - 12x \ 21x + 12x = 40 - 25 \ 33x = 15 \ x = frac{15}{33}$
к)
$frac{4}{15} + frac{2}{3} x = x - frac{7}{10} \ frac{8}{30} + frac{20x}{30} = frac{30x}{30} - frac{21}{30} \ 8 + 20x = 30x - 21 \ 20x - 30x = - 21 - 8 \ - 10x = - 29 \ x = - frac{29}{10} = - 2.9$