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1. E={0,5,10,15,20}

a)5 nu apartine E-Fals

b)card E=5-Adevarat

2.A={1,3,5,7,9}

B={3,30,21}

C={x|x € N, 2 mai mic sau egal x < 9}

a)B este multimea infinita

c)C={2,3,4,5,6,7,8}

card C=7

d)A={x|x € N, 1 mai mic sau egal x < 9}

A={1,2,3,4,5,6,7,8}

card A=8

e)M={1,3,5,3,30,2}

card M=6

3.a) M={567,576,765,756,657,675}

b)card M=6

Răspuns:

Explicație pas cu pas:

1. a) F

b) A

2. a)B

b) B={3,6,9,12 ...}

c) C={2,3,4,5,6,7,8}

card C = 7

d)A={x I x nr impar si 1≤x≤9}

e)M=A∩B∩C={3,9}

card M = 2

3 a) M={567, 576, 657, 675, 756, 765}

b) card M = 6