1) -4 2) 10 3) 2 4) нет корней 5) 8
Пошаговое объяснение:
1) 3x - 5 = 7 + 6x
3x - 6x = 7 + 5
-3x = 12
x = 12 : ( -3 )
x = - 4
2) -8х + 20=-40- 10х
-8x + 10x = 40 - 20
2 x = 20
x = 20 : 2
x = 10
3) 2(4х-10)=8- 6х
8 x - 20 = 8 - 6x
8x + 6 x = 8 + 20
14x = 28
x = 28 : 14
x = 2
4)5 -(3х+2)=7х - 10
5 - ( 3x - 2 ) = 7x - 10
15x - 10 = 7x - 10
15x - 7x = - 10 + 10
8x = 0
ответ : корней нет
5)20(х- 2)=15х
20x - 40 = 15x
20x - 15x = 40
5x = 40
x = 40 : 5
x = 8
1) -4 2) 10 3) 2 4) нет корней 5) 8
Пошаговое объяснение:
1) 3x - 5 = 7 + 6x
3x - 6x = 7 + 5
-3x = 12
x = 12 : ( -3 )
x = - 4
2) -8х + 20=-40- 10х
-8x + 10x = 40 - 20
2 x = 20
x = 20 : 2
x = 10
3) 2(4х-10)=8- 6х
8 x - 20 = 8 - 6x
8x + 6 x = 8 + 20
14x = 28
x = 28 : 14
x = 2
4)5 -(3х+2)=7х - 10
5 - ( 3x - 2 ) = 7x - 10
15x - 10 = 7x - 10
15x - 7x = - 10 + 10
8x = 0
ответ : корней нет
5)20(х- 2)=15х
20x - 40 = 15x
20x - 15x = 40
5x = 40
x = 40 : 5
x = 8