Question

Scrie multimea A={x|xeN,2x+7≤20

Answer 1

2X + 7 ≤ 20 
2X ≤ 20 - 7 
2X ≤ 13
X ≤ 13/ 2
X ≤ 6,5
X ∈ ( - 00, 6,5]
x ∈ N intersectat cu ( - 00, 6,5] ⇒ x ∈ { 1,2,3,4,5,6,}

Answer 2

2X + 7 ≤ 20 
2X ≤ 20 - 7 
2X ≤ 13
X ≤ 13/ 2
X ≤ 6,5
X ∈ ( - 00, 6,5]
x ∈ N intersectat cu ( - 00, 6,5] ⇒ x ∈ { 1,2,3,4,5,6,}