Răspuns :
fie nr=,,a" si ,,b"
a:b=5 rest 3 =>a=5xb+3
a-b=31 adica 5b+3-b=31
4b+3=31
4b=31-3
4b=28
b=28:4
b=7 =>a=5x7+3
a=35+3
a=38
a:b=5 rest 3 =>a=5xb+3
a-b=31 adica 5b+3-b=31
4b+3=31
4b=31-3
4b=28
b=28:4
b=7 =>a=5x7+3
a=35+3
a=38
x : y = 5 (rest 3) => x = 5y+3 *
si x - y = 31 => x = 31+y **
inseamna ca 5y+3 = 31+y | -y si -3
5y - y = 31 - 3
4y = 28 | :4
y = 7
⇒ x = 5*7+3 = 38
si x - y = 31 => x = 31+y **
inseamna ca 5y+3 = 31+y | -y si -3
5y - y = 31 - 3
4y = 28 | :4
y = 7
⇒ x = 5*7+3 = 38