Question

(a;b)=5 ,a*b=75 ,a+b=?

Answer 1

[a,b]×(a,b)=a×b
[a,b]=75:5
[a,b]=15
din (a,b)=5
a=5x
b=5y
5x×5y=75
x×y=3
x=1 ,a=5
y=3 ,b=15
a+b=20
sau
x=3,a=15
y=1,b=5
a+b=20