Решите уравнения: 1). 2(x+2) - 4(x-3) = 5x + 9 2). - вопрос №757512412243592234153 от дильназ149 10.11.2022 15:59

Question

Математика: Решите уравнения: 1). 2(x+2) - 4(x-3) = 5x + 9 2). 2(х-3)-4(x+1) = 5x - 38 3). 4/7x + 1 3/7 = 6/7x - 5 5/7

дильназ149 · Answer

1) 2(x+2) - 4(x-3) = 5x + 9
2x + 4 - 4x + 12 = 5x + 9
2x - 4x - 5x = 9 - 4 - 12
-7x = -7
x = 1
2) 2(x-3) - 4(x+1) = 5x - 38
2x - 6 - 4x - 4 = 5x - 38
2x - 4x - 5x = -38 + 6 + 4
-7x = -28
x = 4
3) 4/7x + 1 3/7 = 6/7x - 5 5/7
4/7x - 6/7x = -5 5/7 - 1 3/7
-2/7x = -7 1/7
x = 25