Răspuns :
a=9b+7; (înlocuim în formula a-b=71ce știm); apoi,9b+7-b=71=>8b=71-7=>8b=64=>b=64:8=>b=8;
apoi,a-8=71=>a=71+8=>a=79;
a:b=9r7 =>a=bx9+7
a-b=71
b /----/
a /----/----/----/----/----/----/----/----/----/ +7
8parti egale
71-7=64(8parti egale)
64:8=8(b)
8x9+7=72+7=79(a)
V:79-8=71
succes
a-b=71
b /----/
a /----/----/----/----/----/----/----/----/----/ +7
8parti egale
71-7=64(8parti egale)
64:8=8(b)
8x9+7=72+7=79(a)
V:79-8=71
succes