\(\dfrac{4}{7}v\text{à }\dfrac{16}{63}\\ \dfrac{4}{7}=\dfrac{4\cdot9}{7\cdot9}=\dfrac{36}{63}\\ \dfrac{36}{63}>\dfrac{16}{63}\\ \Rightarrow\dfrac{4}{7}>\dfrac{16}{36}\) 

\(\dfrac{4}{17}\) và \(\dfrac{16}{63}\)

\(\dfrac{4}{63}>\dfrac{16}{63}\)

\(=>\dfrac{4}{17}>\dfrac{16}{63}\)

\(\dfrac{5}{29}\) và \(\dfrac{7}{33}\)

\(\dfrac{5}{33}< \dfrac{7}{33}\)

\(=>\dfrac{5}{29}< \dfrac{7}{33}\)

\(\dfrac{44}{57}\) và \(\dfrac{89}{99}\)

\(\dfrac{44}{99}< \dfrac{89}{99}\)

\(=>\dfrac{44}{57}< \dfrac{89}{99}\)

\(\dfrac{19}{53}\) và \(\dfrac{30}{73}\)

\(\dfrac{19}{73}>\dfrac{30}{73}\)

\(=>\dfrac{19}{53}>\dfrac{30}{73}\)

Ta có:

4/17<4/16=1/4

16/63>16/64=1/4

Do 4/17<1/4<16/63 

Nên 16/63>4/17

\(\dfrac{4}{17}=\dfrac{16}{68}\\ Vì:\dfrac{16}{68}< \dfrac{16}{63}\Rightarrow\dfrac{4}{17}< \dfrac{16}{63}\\ ---\\ \dfrac{1007}{1009}=1-\dfrac{2}{1009};\dfrac{1005}{1007}=1-\dfrac{2}{1007}\\ Vì:\dfrac{2}{1009}< \dfrac{2}{1007}\Rightarrow1-\dfrac{2}{1009}>1-\dfrac{2}{1007}\\ \Rightarrow\dfrac{1007}{1009}>\dfrac{1005}{1007}\)

a: 4/17=16/68

16/68<16/63

=>4/17<16/63

b: 19/53<20/53

20/53<20/50(Vì 53>50)

=>19/53<20/50=2/5

mà 2/5=30/75<30/73

nên 19/53<30/73

c: 1007/1009=1-2/1009

1005/1007=1-2/1007

1009>1007

=>2/1009<2/1007

=>-2/1009>-2/1007

=>1007/1009>1005/1007

phân số tg là 88/99

88/99<89/99

88/99>88/104=44/57

nên 44/57<89/99

HYC-30/1/2022

1. 13/21 =182/294   ,  9/14 =189/294 . Vì 182 < 189 => 13/21<9/14 

2. 6/17 = 150/425    ,  9/25 = 153/425 . Vì 150< 153 => 6/17 < 9/25

3. 13/57 = 949/4161 , 29/73= 1653/4161 . Vì 949<1653 =>13/57< 29/73

4. 15/12 > 1 , 42/43 <1 => 15/12 > 42/43

5. 17/16 = 255/240    , 16/15 =256/240 .Vì 255<256 =>17/16<16/15

7. 8 /10 = 4/5= 24/30 , 5/6= 25/30 . Vì 24<25 => 3+5/4+6< 5/6  

1. 13/21 =182/294   ,  9/14 =189/294 . Vì 182 < 189 => 13/21<9/14 

2. 6/17 = 150/425    ,  9/25 = 153/425 . Vì 150< 153 => 6/17 < 9/25

3. 13/57 = 949/4161 , 29/73= 1653/4161 . Vì 949<1653 =>13/57< 29/73

4. 15/12 > 1 , 42/43 <1 => 15/12 > 42/43

5. 17/16 = 255/240    , 16/15 =256/240 .Vì 255<256 =>17/16<16/15

7. 8 /10 = 4/5= 24/30 , 5/6= 25/30 . Vì 24<25 => 3+5/4+6< 5/6  

a)13/57 và 29/73 MC(4161)

13/57 = 13.73/57.73 = 949/4161

29/73 = 29.57/73.57 = 1653/4161

949/4161 < 1653/4161 nên 13/57 < 29/73

b) 7/-12 và 11/-18 MC(36)

7/-12 = -7/12 = -7.3/12.3 = -21/36

11/-18 = -11/18 = -11.2/18.2 = -22/36

-21/36 > -22/36 nên 7/-12 > 11/-18

a) <

b) >

duyệt

a) <

b)>

a) <

b) >

Ta co:

\(\frac{58}{89}< \frac{58}{87}=\frac{2}{3}=\frac{36}{54}< \frac{36}{53}\)

Hay :\(\frac{58}{89}< \frac{36}{53}hay\frac{36}{53}>\frac{58}{89}\)
 

5/7<7/6
17/13>45/52
4/3>99/100
34/56<42/53
97/252>85/163
73/97<91/95
 

5/7<7/6
17/13>45/52
4/3>99/100
34/56<42/53
97/252>85/163
73/97<91/95

ko có rảnh đâu nha con

1<

2>

3>

4<

5>

6<