\(\frac{2015}{2016}< \frac{2016}{2017}\)

\(\frac{2018}{2018}< \frac{2018}{2019}\)

Ta có:

1-2015/2016=1/2016

1-2016/2017=1/2017

Vì 1/2016>1/2017=>2015/2016<2016/2017

Ta có:

2018/2018=1

2019/2018>1

=>2018/2018<2019/2018

2015/2016<2016/2017

2018/2018<2019/2018

Đặt a=2018

\(A=\frac{2017+2018}{2019+2020}=\frac{2a-1}{2a+3}\)

\(B=\frac{2008}{2018}=\frac{a-10}{a}< \frac{2a-10}{2a}< \frac{2a-7}{2a+3}< \frac{2a-1}{2a+3}=A\)

Phú Qúy Lê Tăng khó hiểu wá (vẫn hiểu đc) :v

Kết bạn ko

a 

oki

\(\frac{2017}{2018}\)<\(\frac{2018}{2019}\)

\(A=\frac{2017^{2018+1}}{2017^{2018-3}}\)và \(B=\frac{2017^{2018-1}}{2017^{2018-5}}\)

Có \(A=\frac{2017^{2019}}{2017^{2015}}\)và \(B=\frac{2017^{2017}}{2017^{2013}}\)

Mà\(\frac{2017^{2019}}{2017^{2015}}>\frac{2017^{2018}}{2017^{2015}}\)và\(\frac{2017^{2017}}{2017^{2013}}>\frac{2017^{2017}}{2017^{2015}}\)

Vì \(\frac{2017^{2018}}{2017^{2015}}>\frac{2017^{2017}}{2017^{2015}}\)

Vậy A>B

78/78 < 79/78

35/145 > 35/175

2017/2018 < 2018/2019

K mk nhé

\(\frac{78}{78}< \frac{79}{78}\)

\(\frac{35}{145}>\frac{35}{175}\)

\(\frac{2017}{2018}< \frac{2018}{2019}\)

Hok tốt!

Ko chắc câu cuối nha~!

ko biết

không quy đồng phân số hãy so sánh 2 phân số sau: 2017/ 2018 và 2016/2017

Ta so sánh 1/2018 và 1/2017

1/2018<1/2017

=> 2017/2018>2016/2017

\(\text{Ta có :}\)

\(\frac{2017}{2018}=1-\frac{1}{2018}\)

\(\frac{2016}{2017}=1-\frac{1}{2017}\)

\(\text{Vì }\frac{1}{2018}< \frac{1}{2017}\Rightarrow1-\frac{1}{2018}>1-\frac{1}{2017}\)

\(\Rightarrow\frac{2016}{2017}< \frac{2017}{2018}\)

\(\frac{2017}{2018}\)và   \(\frac{2019}{2020}\)

Ta có : \(1-\frac{2017}{2018}=\frac{1}{2018};1-\frac{2019}{2020}=\frac{1}{2020}\)

Vì \(\frac{1}{2018}>\frac{1}{2020}\)nên \(\frac{2017}{2018}< \frac{2019}{2020}\)

Cái này là so sánh bằng phần bù của đơn vị nha bn !

Học tốt #

\(\frac{2017}{2018};\frac{2018}{2019};\frac{2019}{2020}\)

 \(\Rightarrow\frac{2017}{2018}< \frac{2019}{2020}\)

2017/2018 = 1-1/2018

2019/2020=1-1/2020

ta có : 1/2018>1/2020 nên 2019/2020>2017/2018