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

Question

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

Answer 1

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

Answer 2

1. (2x+4)-(4x-12)=5x+9
2x+4x-5x=9+12-4
x=18
2. (2x-6)-(4x+4)=5x-38
2x+4x-5x=-38+6-4
x=-36
3. 4/7x- 6/7x=-5 5/7 - 1 3/7
-2/7x=4 2/7/-2/7
x=4

Comments

Все уравнения решены неверно