Решите двойное неравенство 1) - 7 <2 х-5<=1 2) 1 <=3-х<=5

1)

-7 < 2x-5 ≤ 1

-7+5 < 2x-5+5 ≤ 1+5

-2 < 2x ≤ 6

-2:2 < 2x:2 ≤ 6:2

-1 < x ≤ 3

Ответ: (-1; 3]

2)

1 ≤ 3-x ≤ 5

1-3 ≤ 3-x-3 ≤ 5-3

-2 ≤ - x ≤ 2

-2 * (-1) ≥ - x * (-1) ≥ 2 * (-1)

2 ≥ x ≥ - 2

-2 ≤ x ≤ 2

Ответ: [-2; 2]