Пошаговое объяснение:
3)
3*(y - 5) = 6 * 4
3y - 15 = 24
3y = 24 + 15
3y = 39
y = 39 : 3
y = 13
4)
2*(x + 3) = 6 * 5
2x + 6 = 30
2x = 30 - 6
2x = 24
x = 24 : 2
x = 12
5)
5*(2x - 3) = 15 * 6
10x - 15 = 90
10x = 90 + 15
10x = 105
x = 105 : 10
x = 10,5
6)
4x : 5 = 12 : 20
4x * 20 = 12 * 5
80x = 60
x = 60 : 80
x = 0,75
Пошаговое объяснение:
3)
3*(y - 5) = 6 * 4
3y - 15 = 24
3y = 24 + 15
3y = 39
y = 39 : 3
y = 13
4)
2*(x + 3) = 6 * 5
2x + 6 = 30
2x = 30 - 6
2x = 24
x = 24 : 2
x = 12
5)
5*(2x - 3) = 15 * 6
10x - 15 = 90
10x = 90 + 15
10x = 105
x = 105 : 10
x = 10,5
6)
4x : 5 = 12 : 20
4x * 20 = 12 * 5
80x = 60
x = 60 : 80
x = 0,75