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16 tháng 5 2018

(1999/2011-2011/1999) - (-12/1999 - 12/2011) 
= 1999/2011 - 2011/1999 + 12/1999 + 12/2011 
= (1999/2011 + 12/2011) - 1999/1999 - 12/1999 + 12/1999 
= ( 1-1 ) + ( -12/1999 + 12/1999) 
= 0 + 0 
= 0 

9 tháng 5 2019

(1999/2011-2011/1999)-(12/1999-12/2011)

=1999/2011-2011/1999-12/1999+12/2011

=(1999/2011+12/2011)-(2011/1999-12/1999)

=1-1

=0

4 tháng 4 2017

\(\frac{1999}{2011}-\frac{2011}{1999}-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)-\frac{2011}{1999}+\frac{12}{1999}\)

\(=1-\left(\frac{2011}{1999}-\frac{12}{1999}\right)\)

\(=1-1\)

\(=0\)

NHÉ !!!!!!! 

4 tháng 4 2017

Ta có : \(\frac{1999}{2011}-\frac{2011}{1999}-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

=\(\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

=\(\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(\frac{12}{1999}-\frac{2011}{1999}\right)\)

=1-1

=0

27 tháng 7 2016

\(\left(\frac{1999}{2011}-\frac{2011}{199}\right)-\left(-\frac{12}{1999}-\frac{12}{2001}\right)\)

=\(\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

=\(\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(-\frac{2011}{1999}+\frac{12}{1999}\right)\)

=\(\frac{2011}{2011}+\frac{1999}{1999}\)

=1+1

=2

27 tháng 7 2016

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

=\(\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

=\(\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(\frac{-2011}{1999}+\frac{12}{1999}\right)\)

=1-1

=-2

14 tháng 8 2020

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(-\frac{2011}{1999}+\frac{12}{1999}\right)\)

\(=\frac{2011}{2011}+\frac{-1999}{1999}=1+\left(-1\right)=0\)

14 tháng 8 2020

\(\frac{1999}{2011}-\frac{2011}{1999}-\left(\frac{-12}{1999}-\frac{12}{2011}\right)=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)-\left(\frac{2011}{1999}-\frac{12}{1999}\right)=1-1=0\)

29 tháng 4 2019

A=1999/2011-2011/1999-(-12/1999)-12/2011

A = ( 1999/2011 - 2011/1999 ) - ( -12/1999 - 12/2011 )

=1999/2011-2011/1999+12/1999+12/2011

=(1999/2011+12/2011)-(2011/1999-12/1999)

=1-1

=0

Vậy A=0

B = 2/5 + [ 3/11 + (-2)/5 ]

=[2/5+(-2/5)]+3/11

=0+3/11

=3/11

27 tháng 4 2021

Giãi tay mk bạn ê

27 tháng 4 2021

kết quả là 0 nhé

11 tháng 5 2016

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(\frac{-2011}{1999}+\frac{12}{1999}\right)=\frac{2011}{2011}-\frac{1999}{1999}=1-1=0\)

11 tháng 5 2016

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(-\frac{12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(-\frac{2011}{1999}+\frac{12}{1999}\right)\)

\(=1+\left(-1\right)\)

\(=0\)

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(\left(\frac{1999}{2011}+\frac{12}{2011}\right)-\left(\frac{2011}{1999}+\frac{-12}{1999}\right)\)

\(\frac{2011}{2011}-\frac{1999}{1999}\)= 1-1 =0

5 tháng 4 2018

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}=\frac{1999}{2011}+\frac{12}{2011}\)\(+\left(\frac{-2011}{1999}+\frac{12}{1999}\right)\)\(=1+\left(-1\right)=0\)

12 tháng 4 2019

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\frac{2011}{2011}-\frac{1999}{1999}\)

\(=1-1=0\)

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\frac{2011}{2011}-\frac{1999}{1999}\)

\(=1-1=0\)

17 tháng 4 2018

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}-\frac{12}{1999}+\frac{12}{2011}\)

\(=(\frac{1999}{2011}+\frac{12}{2011})-(\frac{2011}{1999}-\frac{12}{1999})\)

\(=1-1=0\)

26 tháng 6 2020

\(\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\)

\(=\frac{1999}{2011}-\frac{2011}{1999}+\frac{12}{1999}+\frac{12}{2011}\)

\(=\left(\frac{1999}{2011}+\frac{12}{2011}\right)+\left(\frac{-2011}{1999}+\frac{12}{1999}\right)\)

\(=1-1\)

\(=0\)

Linz