А) |a|∈{17,8; 0; 9/11; 21,(4); 9/11}
б) |a|∈{2,93; 3; 15/4; 7 2/3; 8}
1)12*3+2=36+2=38
a=38
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2)18*5+2=90+2=92
c=92
Произведем умножение -15,72х-220,08=0 -15,72x=220,08 . x=220,08/15,72 x=-14
1) [3, ∞), (-∞, 5], [-7, ∞)
2) (-9, ∞), (-∞, 10), (2, ∞)
3) [-9, 5], [0, 12], [-10, -1]
4) (-3, -1), (2, 8),(-5, 10)
5) (-7, -2], [3, 6),(-4, 8]