Question

aflati numerele naturale x si y,stiind ca: a) (x-1)(y+1)=10

Answer 1

(x-1)(y+1)=10=2*5

=> x-1=2, deci x=3, sau x-1=5, deci x=6

=> y+1=5, deci y=4, sau y+1=2, deci y=1

Avem perechile de numere:

(3;4) , (6;1)