Question

a)3(x-2)mai mic sau egal cu 3
b)(x+2)*3-45mai mic sau egal 15
c18x-14.mai maresau egal cu 2*(3x+5)
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Answer 1

a)3(x-2)≤ 3
x-2≤3:3
x-2≤1
x≤1+2
x≤3
x∈{0,1,2,3}

b)(x+2)*3-45≤15

(x+2)*3≤15+45

(x+2)*3≤60

x+2≤60:3

x+2≤20

x≤20-2

x≤18

x∈{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18}


c.18x-14.≥2*(3x+5)

2*(9x-7).≥2*(3x+5)
9x-7≥3x+5
9x-3x≥5+7
6x≥12
x≥12:6
x≥2
x∈{2,3,4...∞}