Question

Numerele rationale pozitive a , b ,c sunt direct proportionale cu numerele 2 ,3, 4 stiin ca 6a la a doua + b la a doua - 2c la a 2= 9 Aflati a,b,c

Answer 1

a/2=b/3=c/4=k
a=2k
b=3k
c=4k
6a²+b²-2c²=9
24k²+9k²-32k²=9
k²=9
k=3
a=6
b=9
c=12