Ответы
1) - (x - 6)(x - 4) > 0
(x - 6)(x - 4) < 0
+ - +
______₀______₀______
4 6
////////////////
x ∈ (4 ; 6)
2) x(x - 1)(x + 4) ≤ 0
- + - +
______[- 4]_______[0]_______[1]______
/////////////// ///////////////////
x ∈ ( - ∞ ; - 4 ] ∪ [0 ; 1]
3) (x - 4)(x + 7)(x - 6) < 0
- + - +
______₀_______₀_______₀_____
- 7 4 6
///////////// ////////////////
x ∈ ( - ∞ ; - 7) ∪ (4 , 6)
4) (x - 9)(x - 1)(x + 5) > 0
- + - +
______₀_____₀______₀_______
- 5 1 9
//////////// ///////////////
x ∈ ( - 5 ; 1) ∪ (9 ; + ∞)