1) |x|≤ 3,22)|×|<1,93)|×|≤5,784)|×|<0,89​

|f(x)| <= A (A > 0) ⇒ - A <= f(x) <= A

1) |x|≤ 3,2

-3. 2 ≤ x ≤ 3. 2

2)|×|<1,9

-1. 9 < x < 1. 9

3)|×|≤5,78

-5. 78 ≤ x ≤ 5. 78

4)|×|<0,89​

-0,89 < x < 0. 89