so sanh :A=2013^2012+1/2013^2013+1 va 2013^2013+1/2013^2014+1
so sanh a va b : a= 2013^2012+1/2013^2013+1
b=2013^2013+1/2013^2014+1
A=2012/2013+2013/2014, B=2012+2013/2013+2014. So sanh A va B
Ta có: 1- 2012/2013=1/2013
1- 2013/2014=1/2014
Mà 1/2013>1/2014
vậy 2012/2013<2013/2014
Thực hiện so sánh: A = 2013^2012+1/2013^2013+1
với 2013^2013 +1/ 2013^2014 + 1
so sanh a va b
a = 2014 x 2012
b = 2013 x 2013
a= (2000+ 14) . (2000+12)= 2000(14+12)= 2000. 168
b= 2000 . 169
vậy b>a
Ta có:
A=2012 x 2014
B = 2013 x 2013 = 2012 x 2014 + 1
Vậy B lớn hơn A
A = 2014 x (2011 + 1) = 2013 x 2012 + 2013
B = (2012 + 1) x 2013 = 2013 x 2012 + 2013
Ta thấy 2012 > 2011 nên A > B (A = B + 1)
thực hiện so sánh:
A=20132012+1/20132013+1 với B=20132013+1/20132014+1
So sánh ;A=2014^2013+1/2014^2013-1 va B=2014^2013-1/2014^2013-3.giup mk vs
ta có: \(A=\frac{2014^{2013}+1}{2014^{2013}-1}=\frac{2014^{2013}-1+2}{2014^{2013}-1}=1+\frac{2}{2014^{2013}-1}\)
\(B=\frac{2014^{2013}-1}{2014^{2013}-3}=\frac{2014^{2013}-3+2}{2014^{2013}-3}=1+\frac{2}{2014^{2013}-3}\)
\(\Rightarrow\frac{2}{2014^{2013}-1}< \frac{2}{2014^{2013}-3}\)
\(\Rightarrow1+\frac{2}{2014^{2013}-1}< 1+\frac{2}{2014^{2013}-3}\)
=> A < B
So sanh 2 phan so sau:
2012 va 2013
2013 2014
\(\frac{2012}{2013}\)và \(\frac{2013}{2014}\)
=>\(\frac{2012}{2013}\) >\(\frac{2013}{2014}\) vì rút gọn\(\frac{2012}{2013}\frac{2013}{2014}=\frac{2012}{1}\frac{1}{2014}\)
=>\(\frac{4052168}{2014}>\frac{2014}{2014}\)
ĐÓ MÌNH LÀM XONG RỒI
Khải ơi bạn làm bài này theo phương pháp phần bù dc mà
So sanh: \(A=\frac{2014^{2013}+1}{2014^{2014}+1}\) va \(B+\frac{2014^{2012}+1}{2014^{2013}+1}\)
Giup minh nha, thanks cac ban
\(A=\frac{2014^{2013}+1}{2014^{2014}+1}<\frac{2014^{2013}+1+2013}{2014^{2014}+1+2013}\)
\(=\frac{2014\left(2014^{2012}+1\right)}{2014\left(2014^{2013}+1\right)}\)
\(=\frac{2014^{2012}+1}{2014^{2013}+1}\)\(=B\)
=> A < B
\(\frac{2011\text{X}2013+2014}{2012\text{X}2012+2013}\)voi 1
hay so sanh
\(\frac{2011.2013+2014}{2012.2012+2013}=\frac{2011.2013+2013+1}{2012.2012+2012+1}=\frac{2013.\left(2011+1\right)+1}{2012.\left(2012+1\right)+1}=\frac{2013.2012+1}{2012.2013+1}=1\)
Vậy \(\frac{2011.2013+2014}{2012.2012+2013}=1\)
(Dấu . là nhân nha bạn)
\(\frac{2011.2013+2014}{2012.2012+2013}=\frac{2011.2013+2014}{\left(2011+1\right).\left(2013-1\right)+2013}\)
\(=\frac{2011.2013+2014}{2011.\left(2013-1\right)+2013-1+2014}\)
\(=\frac{2011.2013+2014}{2011.2013-2011+2013-1+2014}\)
\(=\frac{2011.2013+2014}{2011.2013+2015}\)
Vì 2011.2013 + 2014 < 2011.2013 + 2015
=> \(\frac{2011.2013+2014}{2011.2013+2015}< 1\)