1 задание: ( 1-3х ) ( -2х - 3 ) ( 6x - 1 ) ≤0
f ( x ) = ( 1 -3x ) ( -2x - 3 ) ( 6x - 1 )
x - любое число.
( 1 - 3х ) ( -2х - 3 ) ( 6х - 1 ) = 0
х₁ = ⅓ ; х₂ = - 1,5 ; х₃ = ⅙
f ( 1 ) = - 2 × - 5 × 5 > 0
- + - +
₋₋₋₋₋₋₋₋₋₋°₋₋₋₋₋₋₋₋₋₋₋°₋₋₋₋₋₋₋°₋₋₋⇒ f ( ¼ ) = + × - × + < 0
- 1,5 ⅙ ⅓
f ( 0 ) = + × - × - > 0
f ( - 5 ) = + × + × - < 0
x ∈ ( -∞ ; - 1,5 ] ; [ ⅙ ; ⅓ ]