<span>arcСos√ 2/2 + 1/2 = </span>π/4 + 1/2 = (π +2)/4
A = 3 b = 2 c= -5
D = b² - 4ac
D = 4+ 60 = 64
х1,2 = -b₊₋√D / 2a
x 1 = - 2 +√64 / 2 ×3 = -2 + 8 / 6 = 1
x 2 = -2 - 8 /6 ≈ -1,667
Ответ: х1 = 1, х2 = -1,667
(x - 1)³ - x²(x - 1) = 0
x³ - 3x² + 3x - 1 - x³ + x² = 0
- 2x² + 3x - 1 = 0
2x² - 3x + 1 = 0
D = 1
x1 = (3 + 1)/4 = 1
x2 = (3 - 1)/4 = 0.5
1/7х²+6/7=0
1/7х²= -6/7
х²= (-6/7)/(1/7)=(-6/7)*(7/1)= -6
х²= -6
корней нет