Відповіді §.7 - §.8 » §.7 (6)

Розв’яжіть систему нерівностей: 1) x/4 ≥ x/5 –2 ≤ x ≤ 2; 5x ≥ 4x –2 ≤ x ≤ 2 x ≥ 0 –2 ≤ x ≤ 2 x ∈ [0; 2] 2) 4x/7 ≥ 3x/8;|x56 –5 ≤ x ≤ –1; 32x ≥ 21x –5 ≤ x ≤ –1 11x ≥ 0 –5 ≤ x ≤ –1 x ≥ 0 –5 ≤ x ≤ –1 ∅ 3) |12 + 3x| ≤ 24; |7 + 2x| ≤ 5; –24 ≤ 12 + 3x ≤ 24; –5 ≤ 7 + 2x ≤ 5; –36 ≤ 3x ≤ 12; –12 ≤ 2x ≤ –2; –12 ≤ x ≤ 4; –6 ≤ x ≤ –1 x ∈ [–6; –1] 4) |20 – 5x| ≤ 60, |20 – 5x| > 80 ∅