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Aflati x∈N astfel incat:
a) 5x+1≤13;
b) 2(x-5)<10;
c) 3(x-4)≤5;
d) 2x+5>3x

Ajutati-ma va rog!


Răspuns :

a) 5x ≤ 12
x ≤ 12/5 = 2,4
x∈{0, 1, 2}

b) 2x - 10 < 10
2x < 20
x < 10
x∈{0, 1, 2, 3, 4 5, 6, 7, 8, 9}

c) 3x - 12 ≤ 5
3x ≤ 17
x≤ 5,6666
x∈{0, 1, 2, 3,4, 5}

d) x < 5
x∈{0,1, 2, 3, 4}