Question

Решите уравнение .а) 1/3х=12. б)6х-10,2=0. в) 5х-4,5=3х+2,5. г) 2х-(6х-5)=45

Answer 1

$a) \frac{1}{3} x = 12 \\ x = 12 \div \frac{1}{3} \\ x = 12 \times 3 \\ x = 36$

$b)6x - 10.2 = 0 \\ 6x = 0 + 10.2 \\ 6x = 10.2 \\ x = 10 \times \frac{1}{5} \div \frac{6}{1} \\ x = \frac{51}{5} \times \frac{1}{6} \\ x = \frac{51}{30} \\ x = 1 \times \frac{21}{30} \\ x = 1 \times \frac{7}{10}$

$c)5x - 4.5 = 3x + 2.5 \\ 5x - 3x = 2.5 + 4.5 \\ 2x = 7 \\ x = \frac{7}{2} \\ x = 3 \times \frac{1}{2}$

d)$2x - (6x - 5) = 45 \\ 2x - 6x + 5 = 45 \\ - 4x = 45 - 5 \\ - 4x = 40 \\ - x = \frac{40}{4} \\ - x = 10 \\ x = - 10$

Answer 2

В некоторых выполняем перенос переменных на одну сторону от = и чисел на другую сторону