Ответ:
Пошаговое объяснение:
1 )
3 * (х - 4) = 5 * (2х - 3)
3х - 12 = 10х - 15
3х - 10х = 12 - 15
-7х = -3
х = -3 / -7
х = 3/7
2)
2 * (3 + х) = 4 * 3х
6 + 2х = 12х
2х - 12 = -6
-10х = -6
х = -6 : (-10)
х = 6/10
х = 3/5
3)
6 * (3 - х) = 4 * (х + 5)
18 - 6х = 4х + 20
-4х - 6х = 20 - 18
-10х = 2
х= 2 : (-10)
х = -2/10
х = - 1/5
4)
4 * (1 - х) = 12 * (3х - 1)
4 - 4х = 36х - 12
-4х - 36х = -4 - 12
-40х = -16
х = -16 : (-40)
х = 16/40
х = 2/5
5)
3 * (3 - х) = 2 * х
9 - 3х = 2х
-3х - 2х = -9
-5х = -9
х = -9 : (-5)
х = 1,8