Răspunsuri

2014-09-25T16:11:58+03:00
A/3=b/4=k
a=3k
b=4k
c=50%xb=50%x4k=2k
3x3k+5x4k-2x2k=75
9k+20k-4k=75
25k=75
k=3
a=9
b=12
c=6