Răspuns:
[tex]1) \: a + b = 53 \\ a \div b = 3 \: rest \: 5 \\ a = b \times 3 + 5 \\ b \times 3 + 5 + b = 53 \\ 4b = 48 \\ b = 12 \\ a = 41[/tex]
[tex]2) \: a - b = 80 \\ a \div b = 5 \: rest \: 8 \\ a = b \times 5 + 8 \\ 5b + 8 - b = 80 \\ 4b = 72 \\ b = 18 \\ a = 98[/tex]
