Ma poate ajuta cineva va rog.Ofer 12p si coroana.Multumesc mult :-) :-) :-) :-)

Răspuns
a/2=b/3=c/6=k
a=2k
b=3k
c=6k
2a=4k
3b=9k
6c=36k
2a+3b+6c=4k+9k+36k=7
49k=7
k=7/49=1/7
------------------------
a=2/7
b=3/7
c=6/7
----------------
a²=4/49
b²=9/49
c²=36/49
a²+b²+c²=4/49+9/49+36/49=49/49=1
Explicație pas cu pas: