Bài 2:
a: 12/39=4/13=44/143
9/33=3/11=39/143
mà 44>39
nen 12/39>9/33
b: 24/56=3/8
9/15=3/5
mà 3/8<3/5
nên 24/56<9/15
Bài 1:
a) \(\dfrac{7}{9}< \dfrac{15}{13}\)
b) \(\dfrac{5}{3}>\dfrac{3}{4}\)
c)\(\dfrac{14}{29}< \dfrac{23}{25}\)
d)\(\dfrac{39}{31}>\dfrac{38}{37}\)
Bài 2:
a)\(\dfrac{4}{13}>\dfrac{3}{11}\)
b)\(\dfrac{3}{7}< \dfrac{3}{5}\)