Решите уравнения: 3х-5=-4х+1 2(х+7)=9-2х 3/4(4х+8)=9-(7х-1) - вопрос №3541279234489715982409 от cksenia112 25.01.2021 21:29

Question

Алгебра: Решите уравнения: 3х-5=-4х+1 2(х+7)=9-2х 3/4(4х+8)=9-(7х-1) заранее !

cksenia112 · Answer

1. 3х-5= -4х+1
  3x + 4x = 5+1
7x = 6
  x = 6/7

2. 2(х+7)=9-2х
2x + 14 = 9 -2x
2x + 2x = 9-14
4x = -5
  x = -5/4

3. 3/4(4х+8)=9-(7х-1)
3x + 6 = 9 -7x + 1
3x + 7x = 9 -6+1
10x = 4
  x = 4/10 = 2/5