Question

so sánh hân số bằng cách quy đồng tử số 

\(\dfrac{5}{19}\) và \(\dfrac{3}{17}\)

\(\dfrac{3}{11}\) và \(\dfrac{9}{22}\)

Answer 1

`5/19 = ( 5 xx 3 ) / ( 19 xx 3 ) = 15/57`

`3/17 = ( 3 xx 5 ) / ( 17 xx 5 ) = 15/85`

`57<85` hay `15/57 > 15/85`

________________________

`3/11 = (3 xx 2 ) / ( 11 xx2 ) = 6/22`

`6<9` hay `3/11 < 9/22`

Answer 2

a: 5/19=15/57

3/17=15/85

=>5/19>3/17

b: 3/11=9/33<9/22