So sánh
A=\(\frac{2015^{2014}+1}{2015^{2014}-1}\) B=\(\frac{2015^{2014}-1}{2015^{2014}-3}\)
So sánh : \(A=\frac{2015^{2016}+1}{2015^{2015}+1}\) và \(B=\frac{2014^{2015}+1}{2014^{2014}+1}\)
A = \(\frac{2015^{2016}+1}{2015^{2015}+1}=\frac{2015^{2015}+1}{2015^{2015}+1}+\frac{2015}{2015^{2015}+1}=1+\frac{2015}{2015^{2015}+1}\)
B = \(\frac{2014^{2015}+1}{2014^{2014}+1}=\frac{2014^{2014}+1}{2014^{2014}+1}+\frac{2014}{2014^{2014}+1}=1+\frac{2014}{2014^{2014}+1}\)
Rồi bạn tự so sánh nha
So sánh A=\(\frac{2014^{2015}+1}{2014^{2015}+1}\) va B=\(\frac{2014^{2014}+1}{2014^{2013}+1}\)
Ta có :
\(\frac{2014^{2015}+1}{2014^{2015}+1}\)\(=1\)
\(\frac{2014^{2014}+1}{2014^{2013}+1}\)\(>1\)
\(\Rightarrow A< B\)
Vậy \(A< B\)
SO SÁNH
ạ, A = \(A=\frac{2015^{2015}+1}{2015^{2014}+1}VÀB=\frac{2015^{2014}+1}{2015^{2013}+1}\)
SO SÁNH
A, A=\(\frac{2015^{2015}+1}{2015^{2014}+1}VÀB=\frac{2015^{2014}+1}{2015^{2013}+1}\)
B, B= \(\frac{2010^{2015}+1}{2010^{2016}+1}VÀC=\frac{2010^{2014}+1}{2010^{2015}+1}\)
\(B-1=\frac{2015^{2014}+1}{2015^{2013}+1}-1=\frac{2015^{2015}+2015}{2015^{2014}+2015}-1=\frac{2015^{2015}-2015^{2014}}{2015^{2014}+2015}\)
\(A-1=\frac{2015^{2015}+1}{2015^{2014}+1}-1=\frac{2015^{ }^{2015}-2015^{2014}}{2015^{2014}+1}\)
=> A- 1 > B- 1 => A>B
Câu b) Làm tương tự bạn nhé
1) CMR : A=(n+2015)(n+2016) + n2 + n chia hết cho 2 với n ϵ N
2) So sánh :
P = \(\frac{2013}{2014^{2013}}+\frac{2014}{2015^{2014}}+\frac{2015}{2016^{2015}}+\frac{2016}{2017^{2016}}\) và
Q = \(\frac{2014}{2017^{2016}}+\frac{2013}{2016^{2015}}+\frac{2016}{2015^{2014}}+\frac{2015}{2014^{2013}}\)
A = (n + 2015)(n + 2016) + n2 + n
= (n + 2015)(n + 2015 + 1) + n(n + 1)
Tích 2 số tự nhiên liên tiếp luôn chia hết cho 2
=> (n + 2015)(n + 2015 + 1) chia hết cho 2
n(n + 1) chia hết cho 2
=> (n + 2015)(n + 2015 + 1) + n(n + 1) chia hết cho 2
=> A chia hết cho 2 với mọi n \(\in\) N (đpcm)
So sánh 2 phân số : A=2015^2016+1/2015^2015+1 và B=2014^2015+1/2014^2014+1
a) So sánh \(\frac{2013}{2015}\) và \(\frac{2014}{2016}\)
b) So sánh \(\frac{2013+2014}{2014+2015}\) và \(\frac{2013}{2014}+\frac{2014}{2015}\)
a)\(\frac{2013}{2015}< \frac{2014}{2016}\)
b)\(\frac{2013+2014}{2014+2015}< \frac{2013}{2014}+\frac{2014}{2015}\)
ta có tính chất \(\frac{a}{b}\)>1 suy ra \(\frac{a.m}{b.m}\).........
So sánh:
\(\frac{2013}{2014}+\frac{2014}{2015}+\frac{2015}{2016}\)và\(\frac{2013+2014+2015}{2014+2015+2016}\)
so sanh a= 2015^2014+1/2015^2014-1 va b= 2015^2014-1/2015^2014-3
\(A=\frac{2015^{2014}+1}{2015^{2014}-1}=\frac{2015^{2014}-1+2}{2015^{2014}-1}=1+\frac{2}{2015^{2014}-1}.\)
\(B=\frac{2015^{2014}-1}{2015^{2014}-3}=\frac{2015^{2014}-3+2}{2015^{2014}-3}=1+\frac{2}{2015^{2014}-3}\)
mà \(\frac{2}{2015^{2014}-1}< \frac{2}{2015^{2014}-3}\)( 20152014 -1 > 20152014 - 3)
\(\Rightarrow A< B\)