Y(x)=(2x-5)¹⁵
y`(x)=15*(2x-5)¹⁴*(2x-5)`=15*2*(2x-5)¹⁴=30(2x-5)¹⁴
2x(x - 9)² - x²(x - 9) = 0
(x - 9)[2x(x - 9) - x²] = 0
(x - 9)(2x² - 18x - x²) = 0
(x - 9)(x² - 18x) = 0
x(x - 9)(x - 18) = 0
или x₁ = 0 или x - 9 = 0 или x - 18 = 0
x₂ = 9 x₃ = 18
Отвеи : 0 ; 9 ; 18
2,7/1,8 = 27/18 = 3/2 = 1,5
АР-Х ТОГДА .РВ-0.7Х
Х+0.7Х=102
1.7Х=102
Х=102:1.7
Х=60
АР=60