Question

1.Scrieti ca interval urmatoarele multimi:

a) A={x ∈ R I -1 < 2x ≤ 6}

b)G={x ∈ R I x - 5 ≤ 7}

c)B={x ∈ R I 0 < x + 3 <5}

d)D={x ∈ R I √2 ≤ x(supra)3 < 8}



Va rog!

Answer 1

a) A={x ∈ R I -1 < 2x ≤ 6}  => A = (-1/2 , 3]

b) G={x ∈ R I x - 5 ≤ 7}  => x ≤ 12 => G = (-∞ , 12]

c) B={x ∈ R I 0 < x + 3 <5} => -3<x<2 => B = (-3 , 2)

d) D={x ∈ R I √2 ≤ x/3 < 8}  => 3√2 ≤ x < 24 => D = [3√2 , 24)

Answer 2

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