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Ta có:2015/2016>2015/2016+2017+2018
2016/2017>2016/2016+2017+2018
2017/2018>2017/2016+2017+2018-Mình áp dụng so sánh phân số cùng tử đấy.
Suy ra2015/2016+2016/2017+2017/2018>(2015+2016+2017)/(2016+2017+2018)=B
![](https://rs.olm.vn/images/avt/0.png?1311)
A=2016/2017+2017/2018
Do 2016/2017<1,2017/2018<1=> A<2 Hay A<B
![](https://rs.olm.vn/images/avt/0.png?1311)
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Ta có :
\(\frac{2016}{2017}>\frac{2016}{2017+2018+2019}\)
\(\frac{2017}{2018}>\frac{2017}{2017+2018+2019}\)
\(\frac{2018}{2019}>\frac{2018}{2017+2018+2019}\)
\(\Rightarrow\frac{2016}{2017}+\frac{2017}{2018}+\frac{2018}{2019}>\) \(\frac{2016}{2017+2018+2019}+\frac{2017}{2017+2018+2019}+\frac{2018}{2017+2018+2019}\)
\(\Rightarrow P>\frac{2016+2017+2018}{2017+2018+2019}\)
\(\Rightarrow P>Q\)
Chúc bạn học tốt !!!
vì P có các số bé hơn 1 còn Q có các số lớn hơn 1 =>P<Q
Vậy P<Q.
mình làm hơi tắt xin bạn thông cảm bạn tự viết các số có trong P;Q ra nhá
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính A và B rồi ta đi so sánh:
A = \(\frac{2016}{2017}\) + \(\frac{2017}{2018}\) = \(1.999008674\)
B = \(\frac{2016+2017}{2017+2018}\) = \(0.9995043371\)
Mà 1.999008674 > 0.9995043371
Nên: A > B
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\(A=\frac{2017^{2018+1}}{2017^{2018-3}}\)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
![](https://rs.olm.vn/images/avt/0.png?1311)
Vi \(\frac{2017^{2017}+1}{2017^{2018}+1}< 1\)
\(\Rightarrow A=\frac{2017^{2017}+1}{2017^{2018}+1}< \frac{2017^{2017}+1+2016}{2017^{2018}+1+2016}=\frac{2017^{2017}+2017}{2017^{2018}+2017}=\frac{2017\left(2017^{2016}+1\right)}{2017\left(2017^{2017}+1\right)}=\frac{2017^{2016}+1}{2017^{2017}+1}=B\)Vay A < B
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:\(Q=\frac{2015+2016+2017}{2016+2017+2018}=\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
Vì \(\hept{\begin{cases}\frac{2015}{2016}>\frac{2015}{2016+2017+2018}\\\frac{2016}{2017}>\frac{2016}{2016+2017+2018}\\\frac{2017}{2018}>\frac{2017}{2016+2017+2018}\end{cases}}\)
\(\Rightarrow\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}>\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
\(\Rightarrow P>Q\)
Vậy P > Q