ОДЗ
x ∈ (0; 5)
(5 - x)x = 4
- x^2 + 5x - 4 = 0 / *(-1)
x^2 - 5x + 4 = 0
D = 25 - 16 = 9
x1 = (5 + 3)/2 = 4
x2 = (5 - 3)/2 = 1
Ответ
1; 4
(a-5)²-16b²=(a-5)²-(4b)²=((a-5)+4b)((a-5)-4b)=(a-5+4b)(a-5-4b)
x²-y²-5x-5y=(x²-y²)+(-5x-5y)=(x+y)(x-y)-5(x+y)=(x+y)((x-y)-5)=(x+y)(x-y-5)
27-x⁹=3³-(x³)³=(3-x³)(3²+3x³+(x³)²)=(3-x³)(9+3x³+x⁶)