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a) 19 60 < 20 60 = 30 90 < 31 90
b) 15 23 > 14 23 = 70 115 > 70 117
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 311 256 > 1 > 199 203
b) 30 235 = 6 47 > 6 48 = 8 64 > 8 63 = 168 1323
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta co:
\(\frac{58}{89}< \frac{58}{87}=\frac{2}{3}=\frac{36}{54}< \frac{36}{53}\)
Hay :\(\frac{58}{89}< \frac{36}{53}hay\frac{36}{53}>\frac{58}{89}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(\frac{19}{60}< \frac{20}{60}=\frac{1}{3}\)
\(\frac{31}{90}>\frac{30}{90}=\frac{1}{3}\)
=> \(\frac{31}{90}>\frac{1}{3}>\frac{19}{60}\Rightarrow\frac{31}{90}>\frac{19}{60}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 5 − 17 < 2 7 ; b ) 41 − 73 < − 67 − 33 ; c ) 23 21 > 21 23 d ) 19 26 < 21 25 ; e ) 19 40 < 41 80 ; f ) 9 23 > 34 97
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 16 − 19 < 0 < 15 17 b ) 419 − 723 < 0 < − 697 − 313
c ) 311 256 > 1 > 199 203 d ) 30 235 = 6 47 > 6 48 = 8 64 > 8 63 = 168 1323 e ) 19 60 < 20 60 = 30 90 < 31 90 f ) 15 23 > 14 23 = 70 115 > 70 117
26/42 = 13/21
56/78 = 28/36 = 7/9
Mà 13/21 = 117/189, 7/9 = 91/189
Nên : 26/42 > 56/78