1 3/4 = 7/4
2 4/5 = 14/5
7/4 + 14/5 = 35/20 + 56/20 = 91/20
91/20 * 30/1 =(91*3)/2 =273/2 = 136 1/2
х=1, тогда (1+1)(1+2)(1+3)(1+4)=24
X³ + 6x² - x - 6 = 0
(x³ + 6x²) - (x + 6) = 0
x²(x + 6) - (x + 6) = 0
(x + 6)(x² - 1) = 0
(x + 6)(x - 1)(x + 1) = 0
или x + 6 = 0 или x - 1 = 0 или x + 1 = 0
x₁ = - 6 x₂ = 1 x₃ = - 1
Ответ : - 6 ; - 1 ; 1
Відповідь буде така x<-20