Решите уравнения 5,4 – 1,5х = 0,3х – 3,6 2(7x – 7) = 7(х – 3) +7 Карточка № 4 Решите...

Ответ:

$1)5.4 - 1.5x = 0.3x - 3.6 \\ 5.4 + 3.6 = 0.3x + 1.5x \\ 9 =1.8x \\ 1.8x = 9 \\ x = 5$

$2(7x - 7) = 7(x - 3) + 7 \\ 14x - 14 = 7x - 21 + 7 \\ 14x - 7x = 14 - 14 \\ 7x = 0$

Карточка N4

$3(x - 2) = x + 2 \\ 3x - 6 = x + 2 \\ 3x - x = 2 + 6 \\ 2x = 8 \\ x = 4$

$3.4 + 2x = 7(x - 2.3) \\ 3.4 + 2x = 7x - 16.1 \\ 2x - 7x = - 16.1 - 3.4 \\ - 5x = - 19.5 \\ x = 3.9$

Карточка N5

$8x - 8 = 20 - 6x \\ 8x + 6x = 20 + 8 \\ 14x = 28 \\ x = 2$