Решите Уравнение и выполните проверку: 1. 2x=18-4x 2. 9x+45 = 36+7x 3. 89x-23=48-5x

1.

2x = 18-4x

2x+4x = 18

6x = 18

x = 18:6

x = 3

xx-Проверка:

2x = 2*3 = 6

18-4x = 18-4*3 = 18-12 = 6

6 = 6

2.

9x+45 = 36+7x

9x-7x = 36-45

2x = - 9

x = - 9:2

x = - 4,5

Проверка:

9x+45 = 9 * (-4,5) + 45 = - 40,5+45 = 4,5

36+7x = 36+7 * (-4,5) = 36-31,5 = 4,5

4,5 = 4,5

3.

89x-23 = 48-5x

89x+5x = 48+23

94x = 71

x = 71/94

Проверка:

89x-23 = 89*71/94-23 = 6319/94-2162/94 = 4157/91 = 45 62/91

48-5x = 48-5*71/94 = 4512/94-355/94 = 4157/91 = 45 62/91

45 62/91 = 45 62/91