Question

Rezolvati in multimea numerelor naturale inecuatiile:

a) 2x+3 ≥ 11
b) x:4+2 < 5
c) 4x-6 ≤ 2
d) 3 la putera x ≤ 3 la puterea 5

Answer 1

a) 2x + 3 ≥11 / -3
2x ≥11-3
2x=8 / 2
x≥4
x∈ {0,1,2,3,4}
b) x : 4 + 2 < 5 / - 2
x : 4 < 3 / x 4
x < 12
x ∈ { 0,1,2,3,4,5,6,7,8,9,10,11}
c) 4x - 6≤ 2 / +6
4x ≤ 8 / :4
x ≤2
x ∈{ 0,1,2}