Question

 A= 2011  + 2012                                                 B= 2011 + 2012                     So sanh A va B

     2012      2013                                                       2012 + 2013

Answer 1

dễ ợt

B=2011+2012/2012+2013

=2011/2012+2013 +2012/2012+2013<2011/2012 +2012/2013=a

vậy

Answer 2

sao ngan gon the?

Answer 3

Giải cách làm hộ mình với!!!!!!

Answer 4

toi thay cach lam nay k on

Answer 5

Bằng là sai rồi

Answer 6

Bang la sai phai la B > A

Answer 7

Đầu tiên:

Ta có:

B=\(\frac{2011}{2012+2013}\)+  \(\frac{2012}{2012+2013}\) = \(\frac{2011+2012}{2012+2013}\)

Vì:

 \(\frac{2011}{2012+2013}\)< \(\frac{2011}{2012}\); \(\frac{2012}{2012+2013}\)< \(\frac{2012}{2013}\)

\(\Rightarrow\)\(\frac{2011+2012}{2012+2013}\)< \(\frac{2011}{2012}\)+ \(\frac{2012}{2013}\)

Mà \(\frac{2011+2012}{2012+2013}\)= B; \(\frac{2011}{2012}\)+ \(\frac{2012}{2013}\)

Vậy B>A

Answer 8

a>b mới đúng

Answer 9

A= 2011/2012 + 2012/2013 > 2011/2013 + 2012/2013 = 2011+2012/2013 < 2011+2012/2012+2013 = B

Vậy A < B

Answer 10

Mik thấy B>A thì đúng hơn