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3 tháng 10 2019

\(\frac{2019}{2001}=2019:2001\)

\(\frac{2017}{2003}=2017:2003\)

ta có 2019:2001=1,008995502 và 2017:2003=1,006989516

ta có 1,008995502>1,006989516

\(\Rightarrow\)\(\frac{2019}{2001}>\frac{2017}{2003}\)

CHÚC BẠN HỌC TỐT

3 tháng 10 2019

ta có 2019/2001=2019:2001 và 2017/2003=2017:2003

vì 2019:2001 >2017:2003

nên 2019/2001 >2017/2003

3 tháng 10 2019

Ta thấy \(\frac{2019}{2001}< 1\)và \(\frac{2017}{2003}>1\)

\(=>\frac{2019}{2001}< \frac{2017}{2003}\)

~ Chúc hok tốt ~

22 tháng 4 2022

ko biet luon a bn

 

11 tháng 6 2018

Bài 1:

Ta có:

\(N=\frac{2017+2018}{2018+2019}=\frac{2017}{2018+2019}+\frac{2018}{2018+2019}\)

Do \(\hept{\begin{cases}\frac{2017}{2018+2019}< \frac{2017}{2018}\\\frac{2018}{2018+2019}< \frac{2018}{2019}\end{cases}\Rightarrow\frac{2017}{2018+2019}+\frac{2018}{2018+2019}< \frac{2017}{2018}+\frac{2018}{2019}}\)

                                                     \(\Leftrightarrow N< M\)

Vậy \(M>N.\)

Bài 2:

Ta có:

\(A=\frac{2017}{987653421}+\frac{2018}{24681357}=\frac{2017}{987654321}+\frac{2017}{24681357}+\frac{1}{24681357}\)

\(B=\frac{2018}{987654321}+\frac{2017}{24681357}=\frac{1}{987654321}+\frac{2017}{987654321}+\frac{2017}{24681357}\)

Do \(\hept{\begin{cases}\frac{2017}{987654321}+\frac{2017}{24681357}=\frac{2017}{987654321}+\frac{2017}{24681357}\\\frac{1}{24681357}>\frac{1}{987654321}\end{cases}}\)

\(\Rightarrow\frac{2017}{987654321}+\frac{2017}{24681357}+\frac{1}{24681357}>\frac{1}{987654321}+\frac{2017}{987654321}+\frac{2017}{24681357}\)

                                                                     \(\Leftrightarrow A>B\)

Vậy \(A>B.\)

Bài 3:

\(\frac{2016}{2017}+\frac{2017}{2018}+\frac{2018}{2019}+\frac{2019}{2016}=1-\frac{1}{2017}+1-\frac{1}{2018}+1-\frac{1}{2019}+1+\frac{3}{2016}\)

                                                                \(=1+1+1+1-\frac{1}{2017}-\frac{1}{2018}-\frac{1}{2019}+\frac{3}{2016}\)

                                                                \(=4-\left(\frac{1}{2017}+\frac{1}{2018}+\frac{1}{2019}-\frac{3}{2016}\right)\)

Do \(\hept{\begin{cases}\frac{1}{2017}< \frac{1}{2016}\\\frac{1}{2018}< \frac{1}{2016}\\\frac{1}{2019}< \frac{1}{2016}\end{cases}\Rightarrow\frac{1}{2017}+\frac{1}{2018}+\frac{1}{2019}< \frac{1}{2016}+\frac{1}{2016}+\frac{1}{2016}=\frac{3}{2016}}\)

\(\Rightarrow\frac{1}{2017}+\frac{1}{2018}+\frac{1}{2019}-\frac{3}{2016}\)âm

\(\Rightarrow4-\left(\frac{1}{2017}+\frac{1}{2018}+\frac{1}{2019}-\frac{3}{2016}\right)>4\)

Vậy \(\frac{2016}{2017}+\frac{2017}{2018}+\frac{2018}{2019}+\frac{2019}{2016}>4.\)

Bài 4:

\(\frac{1991.1999}{1995.1995}=\frac{1991.\left(1995+4\right)}{\left(1991+4\right).1995}=\frac{1991.1995+1991.4}{1991.1995+4.1995}\)

Do \(\hept{\begin{cases}1991.1995=1991.1995\\1991.4< 1995.4\end{cases}}\Rightarrow1991.1995+1991.4< 1991.1995+1995.4\)

\(\Rightarrow\frac{1991.1995+1991.4}{1991.1995+4.1995}< \frac{1991.1995+1995.4}{1991.1995+4.1995}=1\)

\(\Rightarrow\frac{1991.1999}{1995.1995}< 1\)

Vậy \(\frac{1991.1999}{1995.1995}< 1.\)

2001/2003>2012/2014

1019/1017<1009/1007

6 tháng 3 2020

\(\frac{2001}{2003}\) và \(\frac{2012}{2014}\)

Ta có : \(1-\frac{2001}{2003}=\frac{2003}{2003}-\frac{2001}{2003}=\frac{2}{2003}\)

\(1-\frac{2012}{2014}=\frac{2014}{2014}-\frac{2012}{2014}=\frac{2}{2014}\)

Vì : \(\frac{2}{2003}>\frac{2}{2014}\)nên \(\frac{2001}{2003}< \frac{2012}{2014}\)

( Vì p/s nào có phần bù lớn hơn thì p/s đó nhỏ hơn )

\(\frac{1019}{1017}\)và \(\frac{1009}{1007}\)

Ta có : \(\frac{1019}{1017}-1=\frac{1019}{1017}-\frac{1017}{1017}=\frac{2}{1017}\)

\(\frac{1009}{1007}-1-\frac{1009}{1007}-\frac{1007}{1007}=\frac{2}{1007}\)

Vì : \(\frac{2}{1017}< \frac{2}{1007}\)nên \(\frac{1019}{1017}< \frac{1009}{1007}\)

DD
26 tháng 11 2021

\(\frac{25}{49}>\frac{25}{50}=\frac{1}{2}=\frac{35}{70}>\frac{35}{71}\)

Do đó \(\frac{25}{49}>\frac{35}{71}\).

\(\frac{1997}{2003}=\frac{2003-6}{2003}=1-\frac{6}{2003}\)

\(\frac{1995}{2001}=\frac{2001-6}{2001}=1-\frac{6}{2001}\)

Có \(\frac{6}{2003}< \frac{6}{2001}\)do đó \(\frac{1997}{2003}>\frac{1995}{2001}\).

\(\frac{2020}{2018}=\frac{2018+2}{2018}=1+\frac{2}{2018}< 1+\frac{2}{2016}=\frac{2018}{2016}\)

10 tháng 9 2023

\(a,\dfrac{199}{200}=1-\dfrac{1}{200};\dfrac{200}{201}=1-\dfrac{1}{201}\\ Vì:\dfrac{1}{200}>\dfrac{1}{201}\\ \Rightarrow1-\dfrac{1}{200}< 1-\dfrac{1}{201}\\ Vậy:\dfrac{199}{200}< \dfrac{200}{201}\\ b,\dfrac{2001}{2002}=1-\dfrac{1}{2002};\dfrac{2002}{2003}=1-\dfrac{1}{2003}\\ Vì:\dfrac{1}{2002}>\dfrac{1}{2003}\Rightarrow1-\dfrac{1}{2002}< 1-\dfrac{1}{2003}\\ Vậy:\dfrac{2001}{2002}< \dfrac{2002}{2003}\)

10 tháng 9 2023

\(c,\dfrac{2021}{2020}=1+\dfrac{1}{2020};\dfrac{2020}{2019}=1+\dfrac{1}{2019}\\ Vì:\dfrac{1}{2020}< \dfrac{1}{2019}\\ Nên:1+\dfrac{1}{2020}< 1+\dfrac{1}{2019}\\ Vậy:\dfrac{2021}{2020}< \dfrac{2020}{2019}\\ d,\dfrac{199}{198}=1+\dfrac{1}{198};\dfrac{200}{199}=1+\dfrac{1}{199}\\ Vì:\dfrac{1}{198}>\dfrac{1}{199}\\ Nên:1+\dfrac{1}{198}>1+\dfrac{1}{199}\\ Vậy:\dfrac{199}{198}>\dfrac{200}{199}\)

16 tháng 9 2019

\(\frac{2000}{2001}=1-\frac{1}{2001}\)

\(\frac{2001}{2002}=1-\frac{1}{2002}\)

\(2001< 2002\Rightarrow\frac{1}{2001}>\frac{1}{2001}\)

                             \(\Rightarrow1-\frac{1}{2001}< 1-\frac{1}{2002}\)

                              \(\Rightarrow\frac{2000}{2001}< \frac{2001}{2002}\)

25 tháng 3 2021

ta có:2000/2001=1-1/2001

2001/2002=1-1/2002

mà 2001<2002

suy ra 1/2001>1/2002

suy ra 1-1/2001<1-1/2002

vậy 2000/2001<2001/2002