Question

решите уравнение 5-3(х- 2(х- 2(х- 2)))=2 
1)11 2)2.2 3)7 4)3 5)-4

Answer 1

Равно = 3 (ответ №-4)

5 - 3(x - 2(x - 2(x - 2))) = 2 
5 - 2 = 3(x - 2(x - 2(x - 2))) 
x - 2(x - 2(x - 2)) = 1 
x - 1 = 2(x - 2(x - 2)) = 2(x - 2x + 4) = 2(4 - x) 
x - 1 = 2(4 - x) = 8 - 2x 
x + 2x = 8 + 1 
3x = 9 
x = 3