so sanh
-2012 va (-2014)
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
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=2013^2012+1/2013^2013+1 va 2013^2013+1/2013^2014+1
Đặt B = 2013^2013+1/2013^2014+1
Ta có: \(B=\frac{2013^{2013}+1}{2013^{2014}+1}< \frac{2013^{2013}+1+2012}{2013^{2014}+1+2012}=\frac{2013^{2013}+2013}{2013^{2014}+2013}=\frac{2013\left(2013^{2012}+1\right)}{2013\left(2013^{2013}+1\right)}=\frac{2013^{2012}+1}{2013^{2013}+1}=A\)
Vậy A > B
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)
Cho A = 2014 . 2010 va B = 2012 . 2012
so sanh a va b ma ko tinh gia tri cu the
GIẢI NHANH DÙM
2014 . 2010 > B = 2012 . 2012
Chúc bạn học giỏi !
Ta có: A = 2014 . 2010 = (2012 + 2)(2012 - 2) = 2012^2 + 2.2012 - 2.2012 -4
A = 2012^2 - 4 < 2012^2 = B
Vậy A < B
so sanh a va b : a= 2013^2012+1/2013^2013+1
b=2013^2013+1/2013^2014+1
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
Khong quy dong , hay so sanh cac phan so sau :
a, 1005/2012 va 1006/2014
b, 1002/3003 va 1003/3006
So Sanh : \(A=\frac{2014^{2013}+1}{2014^{2014}+1}\) va \(B=\frac{2014^{2012}+1}{2014^{2013}+1}\)
Giup minh voi nha, Thanks you cac ban