Question

produsul a doua nr naturale este414.Marind unul dintre factori cu 10 produsul nr raman 644.Determinati cele doua nr naturale

Answer 1

X*y=414
(x+10)*y=644
y=414/x
(x+10)*414/x=644
414(x+10)=644x
414x+4140=644x
4140=644x-414x
4140=230x
x=4140/230
x=18
18*y=414
y=414/18
y=23