1)45x1+0=45
proba:45:45=1 rest 0
2) x = 3a + r
x = 10 10 = 3·3 + 1
x = 11 11 = 3·3 + 2
x = 12 12 = 3·4 + 0
x = 13 13 = 3·4 + 1
x = 14 14 = 3·4 + 2
3)a + b = 32
a : b = 6 rest 4
a = 6b + 4
6b + 4 + b = 32
7b = 32 -4
7b = 28
b = 28 : 4
b = 7
a + 7 = 32
a = 32 - 7
a = 25