Пошаговое объяснение:
1)
8x - 7x - 1 = 2*(4x+3)
8x - 7x - 1 = 8x + 6
x - 1 = 8x + 6
8x - x = -1 - 6
7x = -7
x = -1
2)
7*(2x+1) -6*(3x+1) = 2*42
14x + 7 - 18x - 6 = 84
-4x + 1 = 84
-4x = 84 - 1
-4x = 83
x = -83:4
x = -20,75
3)
2*(2x + 3) - 5x - 13 + 3*(5 - 2x) = 6*6
4x + 6 - 5x - 13 + 15 - 6x = 36
-7x + 8 = 36
-7x = 36 - 8
-7x = 28
x = -28:7
x = -4
4)
4x² + 5x + 2*(10 - 2x²) = 5*14
4x² + 5x + 20 - 4x² = 70
5x + 20 = 70
5x = 70 - 20
5x = 50
x = 50:5
x = 10
Пошаговое объяснение:
1)
8x - 7x - 1 = 2*(4x+3)
8x - 7x - 1 = 8x + 6
x - 1 = 8x + 6
8x - x = -1 - 6
7x = -7
x = -1
2)
7*(2x+1) -6*(3x+1) = 2*42
14x + 7 - 18x - 6 = 84
-4x + 1 = 84
-4x = 84 - 1
-4x = 83
x = -83:4
x = -20,75
3)
2*(2x + 3) - 5x - 13 + 3*(5 - 2x) = 6*6
4x + 6 - 5x - 13 + 15 - 6x = 36
-7x + 8 = 36
-7x = 36 - 8
-7x = 28
x = -28:7
x = -4
4)
4x² + 5x + 2*(10 - 2x²) = 5*14
4x² + 5x + 20 - 4x² = 70
5x + 20 = 70
5x = 70 - 20
5x = 50
x = 50:5
x = 10