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Mateydragos9
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Determinati AUB,Asi aici u este rasturantB,A-B,B-A pentru multimile: a)A={a,b,c}=  B={b,c,d}=  b)A={1,2,3,4}= B={1,2,5,6}= c) A={2,4,6,8,10}= B={1,3,5,7} d) A={x apartine N/5x-1,_<24} B={x apartine N cu steluta/3x+1_<7} varog ajutatima ofer  13 pucte.

Răspuns :

a)AUB={a,b,c,d}
AintersectatB={b,c}
A-B={a,b,c}
B-A={b,c,d}
b) AUB={1,2,3,4,5,6}
AintersectatB={1,2}
A-B={1,2,3,4}
B-A={1,2,5,6}
c)AUB={1,2,3,4,5,6,7,8,10}
AintesectatB=Ф
A-B={2,4,6,8,10}
B-A={1,3,5,7}
d)  5x-1≤24
5x≤24+1
x≤25/5
x≤5
x∈{0,1,2,3,4,5}
A={0,1,2,3,4,5}

3x+1≤7
3x≤7-1
x≤6/3
x≤2
B={1,2}
AUB={0,1,2,3,4,5}
Aintersectat B={1,2}
A-{0,1,2,3,4,5}
B-A={1,2}

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