Відповіді АЛГЕБРА: 1.22 (1-2)

1.22

1) f(x) = 37-|x|

D(y): x ≠ ± 7

x є (–∞; –7) U(–7; 7) U (7; ∞)

2) f(x) = 19- x2

D(y): 9 – x² > 0

(3 – x)(3 + x) > 0

x є (–3; 3).

3) f(x) = 1x + 1x2- x-2

D(y): x ≠ 0 x2 – x – 2 ≠ 0

x ≠ 0 x ≠ –1 x ≠ 2

x є (–∞; –1) U (–1; 0) U(0) U (2; ∞)

4) f(x) = x+3x2+ 2x-8

D(y): x + 3 ≥ 0 x2 + 2x – 8 ≠ 0

x ≥ –3x ≠ – 4 x ≠ 2

x є (–3; 2) U (2; ∞).

5) f(x) = 12-x + x

D(y): x ≠ 2 x є [0; 2) U (2; +∞)

x ≥ 0

6) f(x) = x-2 + 4-x

D(y): x – 2 ≥ 0 4 – x ≥ 0

x ≥ 2x ≤ 4

[2; 4].