Răspuns :
a+b+c=78
a=c/2
b=3a⇒ b= 3*c/2=3c/2
c/2+ 3c/2+c=78
4c/2+c=78
2c+c=78
3c=78
c=26
a=26/2
a=13
b=3*13
b=39
13+39+26=78
a=c/2
b=3a⇒ b= 3*c/2=3c/2
c/2+ 3c/2+c=78
4c/2+c=78
2c+c=78
3c=78
c=26
a=26/2
a=13
b=3*13
b=39
13+39+26=78
a+b+c=78 ,a=c/2, b=3a=3c/2, c/2+3c/2+c=78 ,c+3c+2c=156 ,6c=156 ,c=26 ,a=26/2=13 ,b=3a=39,