Ответ:
a) 1, б) 0,6, в) -2 г) 2,5
Объяснение:
а) (x - 2) (x - 3) = x (x+1)
x^2 - 3x - 2x + 6 = x^2 + x
x^2 - 3x - 2x -x^2 - x = -6
-6x = -6
x = 1
б) (x+4) (x+6) - x^2 = 30
x^2 + 6x + 4x + 24 - x^2 = 30
x^2 + 6x + 4x - x^2 = 30 - 24
10x = 6
x = 0,6
в) (x - 5) (x + 1) - x = x^2 + 5
x^2 + x - 5x - 5 - x = x^2 + 5
x^2 + x - 5x - x - x^2 = 5 + 5
-5x = 10
x = -2
(x - 1) (x - 3) = (x - 2) (x - 4)
x^2 - 3x - x + 3 = x^2 - 4x - 2x + 8
x^2 - 3x - x - x^2 + 4x + 2x = 8 - 3
2x = 5
x = 2,5