Răspuns:
1.
1.adevarat
2.adevarat
3.adevarat
4.fals
5.adevarat
6.adevarat
7.adevarat
8.adevarat
2.
a.x=1,4,7
b.x=de la 0-9
c.x-4
3.a.121-11
b.91-7
c.3
d.91
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