(x - 6)(4x - 6) = 0
4x² - 6x - 24x + 36 = 0
4x² - 30x + 36 = 0
2x² - 15x + 18 = 0
D = b² - 4ac = 225 - 4 × 2 × 18 = 225 - 144 = 81 = 9²
x1 = ( 15 + 9) / 4 = 6
x2 = ( 15 - 9) / 4 = 1,5
Ответ: x1 = 6, x2 = 1,5.
-1,8 - х = 9 +2х
- х - 2х = 9 + 1,8
-3х = 10,8
х = 10,8 : (-3)
х = -3,6
125^1/3 + корень из 5*5^1/2=5^(3*1/3)+5^(1/2+1/2)=5+5=10