Reálná čísla, intervaly – cvičné příklady                         

 

 

 

 

A = {x  R; x < 8}

A = (-∞;8)

B = {x  R; x > 4}

B = (4; ∞)

C = {x  R; x ≤  -3}

C = (-∞;-3⟩

D = {x  R; x  ≥ 1}

D = ⟨1; ∞)

E = {x  R; x < -7}

E = (-∞;-7)

F = {x  R; x > -5}

F = (-5; ∞)

G = {x  R; x ≥ -2}

G = ⟨-2; ∞)

H = {x  R; x ≤ 6}

H = (-∞;6⟩

I =  {x  R; -2 < x ≤ 4}

I = (-2; 4⟩

J = {x  R; -7 ≥ x > -8 }

J = (-8; -7⟩