Răspuns:
[tex] 2)7abc = 7689 \\ \: \: 5abcd = 56789[/tex]
[tex]4)a + b = 37 \\ a \div b = 8 \: rest \: 1[/tex]
[tex]6)(3 \times 23789) - (24000 \times 80) = \\ 71367 - 1.920.000[/tex]
[tex]5)(2879 + 6932) - (10000 - 8075) \\ 9811 - 1925 = \\ 7886[/tex]
[tex]3)81200[/tex]