Question

Am cateva probleme: a) Determinati toate nr naturale de forma 3x1y (cu bara deasupra) divizibile cu 6
b) Determinati nr nat a si b,stiind ca (a,b)=5 si a+b=25
c)Determinati nr nat a si b,stiind ca (a,b)=12 si a*b=2160

Answer 1

a)toate nr. naturale=n

3x1y=>x={0,1,2,...,9}=>10 variante

           =>y={6}=>1 varianta

1 varianta*10 variante =10 variante

                                                 =>n={3016,3116,3216,3316,3416,3516,3616,3716,38163916}(cu bara deasupra)