Răspuns :
a:b=4 rest 2 => a=4b+2
a+b=817
4b+2+b=817
5b+2=817
5b=815
b=163
a=4*153+2
a=654
a+b=817
4b+2+b=817
5b+2=817
5b=815
b=163
a=4*153+2
a=654
a : b = 4 rest 2
b = a x 4 + 2
a + b = 817
a + 4a + 2 = 817
5a + 2 = 817
5a = 815
a = 815 : 5
a = 163
b = 163x4+2
b = 654
verificam
163 + 654 = 817
b = a x 4 + 2
a + b = 817
a + 4a + 2 = 817
5a + 2 = 817
5a = 815
a = 815 : 5
a = 163
b = 163x4+2
b = 654
verificam
163 + 654 = 817