0,027a⁹+64b³=(0,3a³)³+(4b)³=(0,3a³+4b)(0,09a⁶+1,2a³b+16b²).
5y² (y - 4) + (4 - y)² = 5y² (y - 4) + (y - 4)² = (y - 4)(5y² + y - 4) =....
<span>b</span>₁ = <span>х - 1
b</span>₂ = <span>3х - 5
b</span>₃ = <span>9х - 19
</span><span>
b</span>₃ : b₂ = b₂ : b₁<span>
(9х - 19)/(3х-5) = (3х-5)/(х-1)
(9x-19)(x-1) = (3x-5)</span>²
<span>9x</span>² - 9x - 19x + 19 = 9x² - 30x + 25
<span>9x</span>² - 28x + 19 - 9x² + 30x - 25 = 0
<span>2x - 6 = 0
2x = 6
x = 3
Ответ: при х=3
</span>
8х" - 12х - 8х" - 16х = 84
- 28х =84
х = - 3