\(\frac{51}{68}\)= \(\frac{3}{4}\)
ta co so do
so be I-----I-----I-----I
so lon I-----I------I-----I-----I
so be la :
15 : [ 4 - 3 ] x 3 = 45
so lon la :
45 + 15 = 60
=> phan so can tim la : \(\frac{45}{60}\) khong can rut gon dau minh thi roi cu an di dung day