Question

Rezolvati in Z ecuatiile: a) x+5<0
b) x+7 mai mic sau mai mare decat - 3 c) -X-1<0
d)-7X mai mare sau mai mic decat -28 e)4x>24
f)3x-8 mai mare sau mai mic decat -11
g)8>6-2x
h)-6 mai mic sau egal 5x +4
i) -4x+13 mai mare sau egal decat 1​

Answer 1

a) x< -5 => x ∈ (-∞,-5)

b) x≤ -10 => x∈ (-∞,-10]

c) -x<1 => x> -1 => x∈ (-1,∞)

d) -x≥ -4 => x≤ 4 => x∈ (-∞,4]

e) x>6 => x∈(6,∞)

h) 5x≤ 4+6 => 5x≤ 10=> x≤ 2 => x∈ (-∞, 2]

f) 3x> -3 => x> -1 => x∈ (-1,∞)

g) 2x>6-8 => 2x> -2 => x> -1 => x∈ (-1,∞)

i) -4x≥ -12 => x≤ 3 => x∈(-∞ 3]