5√b7 * 7√b25 : 7√b11= <span>25b√7/11</span>
2f(2x) = 2 * (1.5 cos 2x) = 3 cos 2x
0,00001 = 1/100000 = 1/10⁵ = 10⁻⁵
1) x² <span>+ 25 = 0
x</span>² = -25<span>
Нет решений!
2) x</span>² - 196 = 0
x² = 196
x = +- 14
3) x² - 196x = 0
x (x - 196) = 0
x = 0 и x = 196
4) x² - 10x + 16 = 0
D = 100 - 16 * 4 = 100 - 64 = 36
x₁ = 10 + 6 / 2 = 8
x₂ = 4 / 2 = 2
5) 8x² - 14x + 5 = 0
D = 196 - 8 * 5 * 4 = 196 - 160 = 36
x₁ = 14 + 6 / 16 = 20 / 16 = 10 / 8 = 5 / 4 = 1,25
x₂ = 14 - 6 / 16 = 8 / 16 = 0,5