So sánh hai phân số khác mẫu số

>    >

> ; >

> ; > nha

tich cho mik nhe

2/5

\(\dfrac{2}{5}=\dfrac{2\times6}{5\times6}=\dfrac{12}{30}\)

\(\dfrac{1}{6}=\dfrac{1\times5}{6\times5}=\dfrac{5}{30}\)

\(\dfrac{12}{30}>\dfrac{5}{30}hay\dfrac{2}{5}>\dfrac{1}{6}\)

1/6

a: 2/4=1/2=6/12

5/15=1/3=4/12

7/28=1/4=3/12

b: 6/8=3/4=15/20

25/125=1/5=4/20

1/4=5/20

c: 14/28=1/2=18/36

9/81=1/9=4/36

2/72=1/36

4/7<5/8<3/4<5/6<6/7<8/9<5/5

92/37+11/37=103/37

23/24+1/4=23/24+6/24=29/24

mà 103/37>29/24

nên 92/37+11/37>23/24+1/4

Ta có: \(\dfrac{23}{24}-1=\dfrac{-1}{24}\)

\(\dfrac{24}{25}-1=\dfrac{-1}{25}\)

mà \(\dfrac{-1}{24}< \dfrac{-1}{25}\)

nên \(\dfrac{23}{24}-1< \dfrac{24}{25}-1\)

hay \(\dfrac{23}{24}< \dfrac{24}{25}\)

103/107=1-4/107

91/95=1-4/95

mà -4/107>-4/95

nên 103/107>91/95

6/5>5/8 nhé

>

6/5>5/8

5 phần = 5 = \(\dfrac{5}{} \) :>

b

<

V

^