Ajutați mă vă rog mult!!!!!

Răspuns:
(6/12)⁽²=1/2=0,5
3/8:20=3/8×1/20=3/160=0,01875
3,5/5=0,7
____________
x/2=3/1=>x=2×3=>x=6
8/x=2/5=>2x=5×8=>x=40:2=>x=20
5/7=10/x=>5x=10×7=>x=70:5=>x=14
___________
a/2=b/4=c/7=k
a=2k
b=4k
c=7k
a+b+c=104
2k+4k+7k=104=>k=104:13=>k=8
a=2×8=16
b=8×4=32
c=7×8=56