Question

aflati numerele naturale a,b,c,,a <b <c daca a) 7a+7b+7c=21

Answer 1

7*(a+b+c)=21

a+b+c=21:7

a+b+c=3

b=a+1

c=b+1=>c=a+1+1

a+a+1+a+1+1=3

a+3=3

a=3-3

a=0

b=1

c=2

a<b<c

0<1<2

0+1+2=3