|f(x)| < a ⇔ -a < f(x) < a
|x - 2| < 3 ⇔ -3 < x - 2 < 3 ⇒ -1 < x < 5
целые 0 1 2 3 4
сумма 0 + 1 + 2 + 3 + 4 = 10
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|f(x)| < a ⇔ -a < f(x) < a
|x - 2| < 3 ⇔ -3 < x - 2 < 3 ⇒ -1 < x < 5
целые 0 1 2 3 4
сумма 0 + 1 + 2 + 3 + 4 = 10