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a) D = R
b) f(x) = -3 wtedy gdy x: {-4, 2}
c) f(0) = -2
d) f(-1) = 0
f(-2) = 2
7.
a) = D = <-5, 1> u (2, 6)
b) f(x) = 0 wtedy gdy x: {-4, -1, 5}
c) f(4) = 3
f(-3) = -2
d) f(x) = 3 wtedy gdy x należy (2, 4>