Răspuns:
Explicație pas cu pas:
1)
a={ 2,8 }
b={ 2,4,6 }
c={ 2,4,6,8,10 }
d={ 3,4,9,5,6,7 }∪{1,2,3,5,7}
d= {1,2,3,4,5,6,7,9 }
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3)
a- F
b-F
c-A
d-A
e-F
f-A
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4)
a)
D₁₈= { 1,2,3,6,9,18 }
D₁₀= { 1,2,5 ,10 }
{ 1,2,3,6,9,18 }∪{ 1,2,5,10 } = { 1, 2,3,5,6,9,10 ,18 }
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b)
M₅ = { 0,5,10,15 ,20 ,25 ...................} ..........M= multiplii lui 5
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c)
2n+4 ≥6
2n≥6-4
2n≥2
n≥2:2
n≥1
n∈{1,2,3...........}
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2n+4< 40
2n<40-4
2n<36
n<36:2
n<18
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A= { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 }
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5)
A= { a,b,x n ,c }
B= {a,b,x ,m,d }
