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a) ta có \(\frac{1234}{1235}=1-\frac{1}{1235}\)
\(\frac{4319}{4320}=1-\frac{1}{4320}\)
vì \(\frac{1}{1235}>\frac{1}{4320}\Rightarrow1-\frac{1}{1235}< 1-\frac{1}{4320}\)
\(\Rightarrow\frac{1234}{1235}< \frac{4319}{4320}\)
b) ta có \(\frac{1234}{1244}=1-\frac{10}{1244}\)
\(\frac{4321}{4331}=1-\frac{10}{4331}\)
vì \(\frac{10}{1244}>\frac{10}{4331}\Rightarrow1-\frac{10}{1244}< 1-\frac{10}{4331}\)
\(\Rightarrow\frac{1234}{1244}< \frac{4321}{4331}\)
\(\Rightarrow\frac{-1234}{1244}>\frac{-4321}{4331}\)
a) \(\frac{1}{1235}>\frac{1}{4320}\Rightarrow-\frac{1}{1235}< -\frac{1}{4320}\Rightarrow1-\frac{1}{1235}< 1-\frac{1}{4320}\Rightarrow\frac{1234}{1235}< \frac{4319}{4320}.\)
b) \(\frac{10}{1244}< \frac{10}{4331}\Rightarrow\frac{10}{1244}-1< \frac{10}{4331}-1\Rightarrow-\frac{1234}{1244}< -\frac{4321}{4331}\)
a) Ta có:
1234/1235 = 1 - 1/1235
4319/4320 = 1 - 1/4320
Vì 1/1235 > 1/4320
=> 1234/1235 < 4319/4320
b) -1234/1244 = -1 + 10/1244
-4321/4331 = -1 + 10/4331
Vì 10/1244 > 10/4331
=> -1 + 10/4331 > -1/4331
Ủng hộ mk nha ♡_♡
Ta có:
\(\dfrac{-1234}{1244}=-1+\dfrac{10}{1244}\)
\(\dfrac{-4321}{4331}=-1+\dfrac{10}{4331}\)
Vì \(\dfrac{10}{1244}>\dfrac{10}{4331}\)
\(\Rightarrow-1+\dfrac{10}{1244}>-1+\dfrac{10}{4331}\)
hay \(\dfrac{-1234}{1244}>\dfrac{-4321}{4331}\)
\(\dfrac{1234}{1244}< \dfrac{1234+3037}{1244+3037}=\dfrac{4331}{4321}\)
\(\Rightarrow\dfrac{1234}{1244}< \dfrac{4331}{4321}\)
\(\Rightarrow-\dfrac{1234}{1244}>-\dfrac{4331}{4321}\)
\(\Rightarrow\dfrac{-1234}{1244}>\dfrac{4331}{-4321}\)
`@` `\text {Ans}`
`\downarrow`
\(\dfrac{253}{-254}=\dfrac{-253}{254}\)
\(-\dfrac{1234}{1232}=\dfrac{-617}{616}\)
Ta có: \(\dfrac{617}{616}>1\) ; \(\dfrac{253}{254}< 1\)
`=>`\(\dfrac{617}{616}>\dfrac{253}{254}\)
`=>`\(\dfrac{-617}{616}< \dfrac{-253}{254}\)
Vậy, \(\dfrac{253}{-254}>\dfrac{-1234}{1232}\).
\(MSC=254.1232\)
\(\dfrac{253}{-254}=\dfrac{-253}{254}=\dfrac{-253.1232}{254.1232}=\dfrac{\text{-311696}}{254.1232}\)
\(\dfrac{-1234}{1232}=\dfrac{-1234.254}{254.1232}=\dfrac{\text{-313436}}{254.1232}\)
mà \(\dfrac{\text{-313436}}{254.1232}< \dfrac{\text{-311696}}{254.1232}\)
\(\Rightarrow\dfrac{-1234}{1232}< \dfrac{253}{-254}\)
\(\)
\(\frac{-1234}{1244}=\frac{10}{1234}-\frac{1244}{1244}=\frac{10}{1234}-1\)
\(\frac{-4321}{4331}=\frac{10}{4331}-\frac{4331}{4331}=\frac{10}{4331}-1\)
Vì 1234<4331 nên \(\frac{10}{1234}>\frac{10}{4331}\)
=>\(\frac{10}{1234}-1
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