a) Ta có:

\(\dfrac{2012}{2013}+\dfrac{1}{2013}=1\)

\(\dfrac{2013}{2014}+\dfrac{1}{2014}=1\)

Vì \(\dfrac{1}{2013}>\dfrac{1}{2014}\) nên \(\dfrac{2012}{2013}< \dfrac{2013}{2014}\)

b) Ta có:

\(\dfrac{1006}{1007}+\dfrac{1}{1007}=1\)

\(\dfrac{2013}{2015}+\dfrac{2}{2015}=1\)

Vì \(\dfrac{1}{1007}=\dfrac{2}{2014}>\dfrac{2}{2015}\) 

nên \(\dfrac{1006}{1007}< \dfrac{2013}{2015}\)

c) ta có:

\(1-\dfrac{64}{73}=\dfrac{9}{73}=\dfrac{153}{1241}\)

\(1-\dfrac{45}{51}=\dfrac{2}{17}=\dfrac{146}{1241}\)

Vì \(\dfrac{153}{1241}>\dfrac{146}{1241}\) nên \(\dfrac{63}{73}>\dfrac{45}{51}\)

a) 2012/2013 và 2013/2014

1-2012/2013=1/2013

1-2013/2014=1/2014

Vì 1/2013> 1/2014 nên 2012/2013<2013/2014

b) 1006/1007 và 2013/2015

1-1006/1007=1/1007=2/2014

1-2013/2015=2/2015

Vì 2/2014>2/2015 nên 1006/1007<2013/2015

c) 64/73 và 45/51

1-64/73=9/73=18/146

1-45/51=2/17=18/153

Vì 18/146> 18/153 nên 64/73<45/51

\(\frac{73}{64}\)có phần hơn với 1 là \(\frac{9}{64}\)

\(\frac{51}{45}\)có phần hơn với 1 là \(\frac{6}{45}\)

Mà \(\frac{9}{64}\)  > \(\frac{6}{45}\)

\(\Rightarrow\frac{73}{64}\)> \(\frac{51}{45}\)

Vậy \(\frac{73}{64}\) > \(\frac{51}{45}\)

9 là phần bù của \(\frac{73}{64}\)

6 là phần bù của \(\frac{51}{45}\)

Vậy \(\frac{73}{64}\)lớn hơn \(\frac{51}{45}\)K CHO MIK NHA

Trả lời :

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Lời giải:

a)

\(\frac{64}{73}=1-\frac{9}{73}=1-\frac{18}{146}\); \(\frac{45}{51}=1-\frac{6}{51}=1-\frac{18}{153}\)

Mà \(\frac{18}{146}> \frac{18}{153}\Rightarrow 1-\frac{18}{146}< 1-\frac{18}{153}\)

\(\Rightarrow \frac{64}{73}<\frac{45}{51}\)

b)

\(\frac{2323}{2424}=\frac{2300+23}{2400+24}=\frac{23(100+1)}{24(100+1)}=\frac{23}{24}=1-\frac{1}{24}\)

\(\frac{20132013}{20142014}=\frac{20130000+2013}{20140000+2014}=\frac{2013(10000+1)}{2014(10000+1)}=\frac{2013}{2014}=1-\frac{1}{2014}\)

Mà \(\frac{1}{24}>\frac{1}{2014}\Rightarrow 1-\frac{1}{24}< 1-\frac{1}{2014}\Rightarrow \frac{2323}{2424}< \frac{20132013}{20142014}\)

1-\(\frac{64}{73}\)=\(\frac{9}{73}\)=\(\frac{153}{1241}\)

1-\(\frac{45}{51}\)=\(\frac{2}{17}\)=\(\frac{146}{1241}\)

vì \(\frac{153}{1241}\)>\(\frac{146}{1241}\)nên \(\frac{63}{73}\)<\(\frac{45}{51}\)

:D

- Quy đồng lên thôi bạn

\(\frac{1006}{1007}=1-\frac{1}{1007}\)

\(\frac{2013}{2015}=1-\frac{2}{2015}\)

\(\frac{1}{1007}< \frac{2}{2015}\Rightarrow\frac{1006}{1007}>\frac{2013}{2015}\)

b) Ta có:
\(1-\frac{1006}{1007}=\frac{1}{1007}=\frac{2}{2014}\)

\(1-\frac{2013}{2015}=\frac{2}{2015}\)
Vì \(\frac{2}{2014}>\frac{2}{2015}\) nên \(\frac{1006}{1007}< \frac{2013}{2015}\)

a) Ta có: \(\frac{2012}{2013}+\frac{1}{2013}=1\)

\(\frac{2013}{2014}+\frac{1}{2014}=1\)

Vì \(\frac{1}{2013}>\frac{1}{2014}\) nên \(\frac{2012}{2013}< \frac{2013}{2014}\)

Vậy: \(\frac{2012}{2013}< \frac{2013}{2014}\)

b) \(\frac{1006}{1007}+\frac{1}{1007}=1\)

\(\frac{2013}{2015}+\frac{2}{2015}=1\)

Mà \(\frac{1}{1007}=\frac{2}{2014}>\frac{2}{2015}\)

nên: \(\frac{1006}{1007}< \frac{2013}{2015}\)

Vậy:.......