1)
a) adevarat; b) fals; c)adevarat; d) adevarat; e) adevarat; f) fals
2) D₁₈={1,2,3,6,9,18}
1+2+3+6+9+18=39
39:3=13⇒Suma divizorilor se divide cu 3
3)
7110,7112,7114,7116,7118
7210,7214,7216,7218
7310,7312,7314,7316,7318
7410,7412,7416,7418518
7610,7612,7614,7618
7710,7712,7714,7716,7718
7810,7812,7814,7816
7910,7912,7914,7916,7918
5x5+4x4=25+16=41 numere
4) 3+25+30=58
a=3
b=5
c=0
5)
a) 4994, 6776,8558
b) 5775
6) nu stiu
