Уравнения 1) 2(n-3)=3(4-n)+5. 2) 5x+2(2x-3)=8-7(x+2). 3) 3,4-0,6b=2b-0,4b+1. 4) -3(y+2,5)=6,9-4,2y. 5) 0,5y+7=5(0,2+1,5y)

Предыдущий
вопрос Следующий
вопрос

1) 2(n-3) = 3(4-n) + 5
2n - 6 = 12 - 3n + 5
2n + 3n = 12 + 6 + 5
5n = 23
n = 23 / 5
n = 4.6

2) 5x + 2(2x-3) = 8 - 7(x+2)
5x + 4x - 6 = 8 - 7x - 14
9x - 6 = -6 - 7x
9x + 7x = -6 + 6
16x = 0
x = 0

3) 3,4 - 0,6b = 2b - 0,4b + 1
3.4 - 0.6b = 2b - 0.4b + 1
3.4 - 1 = 1.6b + 1
2.4 = 1.6b + 1
1.6b = 1.4
b = 1.4 / 1.6
b = 0.875

4) -3(y+2.5) = 6.9 - 4.2y
-3y - 7.5 = 6.9 - 4.2y
-3y + 4.2y = 6.9 + 7.5
1.2y = 14.4
y = 14.4 / 1.2
y = 12

5) 0.5y + 7 = 5(0.2 + 1.5y)
0.5y + 7 = 1 + 7.5y
0.5y - 7.5y = 1 - 7
-7y = -6
y = -6 / -7
y = 0.85714285714