Question

vă rog dau coroana și 60 puncte
ex2​

Answer 1

a)

f(x)>0 ⇔x ∈ {-∞,1)∪(3,+∞)

f(x)≥0 ⇔x ∈ {-∞,1]∪[3,+∞)

f(x)<0 ⇔x ∈ (1,3)

f(x)≤0 ⇔x ∈ [1,3]

b)

f(x)>0 ⇔x ∈ {∅}

f(x)≥0 ⇔x ∈ {∅}

f(x)<0 ⇔x ∈ R

f(x)≤0 ⇔x ∈ R

c)

f(x)>0 ⇔x ∈ R\{2}

f(x)≥0 ⇔x ∈ R

f(x)<0 ⇔x ∈{∅}

f(x)≤0 ⇔x ∈ {2}

d)

f(x)>0 ⇔x ∈ (-1,2)

f(x)≥0 ⇔x ∈ [-1,2]

f(x)<0 ⇔x ∈ {-∞,-1)∪(2,+∞)

f(x)≤0 ⇔x ∈ {-∞,-1]∪[2,+∞)