\(2014^2+\left(2014+2\right)\left(2014-2\right)=2014^2+2014^2-4=2\times2014^2-4\)

2014 x2014+2016 x 2012

=2014+2016 x 2012

=(2014+2016) x 2012

=2012 x 4036

????????

ah hihihi do ngoc

bằng 1 thưa bạn 

=(2014*2013 +2014+2014-2016) : (2012 +2013*2014)

=(2014*2013 +2012):(2012+2013*2014)

í thiếu mất bằng 1

4056191

4056191

tích mình đi mà

4056191 bạn nhé chúc bạn học tốt

( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 4058210 - 2016 ) : ( 2012 + 4054182 )

= 4056194 : 4056194

= 1

﴾ 2014 x 2015 ‐ 2016 ﴿ : ﴾ 2012 + 2013 x 2014 ﴿

= ﴾ 4058210 ‐ 2016 ﴿ : ﴾ 2012 + 4054182 ﴿

= 4056194 : 4056194

= 1

 ( 2014 x 2015 - 2016 ) : (2012 + 2013 x 2014 )

= ( 2014 x ( 2013 + 2 ) - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 2014 x 2013 + 2014 x 2 - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 2014 x 2 - 2016 ) : 2012

=  ( 4028 - 2016 ) : 2012 

=      2012       : 2012

= 1 

\(\frac{2012+2013.2014}{2014.2015-2016}=\frac{2012+2013.2014}{2014.\left(2013+2\right)-2016}\)

                     \(=\frac{2012+22013.2014}{2014.2013+2014.2-2016}\)

                     \(=\frac{2012+2013.2014}{2014.2013+2028-2016}\)

                     \(=\frac{2012+2013.2014}{2014.2013+2012}=1\)

\(\frac{2012+2013.2014}{2014.2015-2016}\)

\(=\frac{2012+2013.2014}{2014.\left(2013+2\right)-2016}\)

\(=\frac{2012+2013.2014}{2014.2013+2014.2-2016}\)

\(=\frac{2012}{2014.2-2016}\)

\(=\frac{2012}{4028-2016}\)

\(=\frac{2012}{2012}\)

\(=1\)

\(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=\frac{1}{x+y+z}\)

\(\Rightarrow\frac{1}{x}+\frac{1}{y}+\frac{1}{z}-\frac{1}{x+y+z}=0\)

\(\Leftrightarrow\frac{yz\left(x+y+z\right)+xz\left(x+y+z\right)+xy\left(x+y+z\right)-xyz}{xyz\left(x+y+z\right)}=0\)

\(\Leftrightarrow\)\(xyz+y^2z+yz^2+x^2z+xyz+xz^2+x^2y+xy^2+xyz-xyz=0\)

\(\Leftrightarrow\)\(\left(xyz+y^2z\right)+\left(xyz+x^2z\right)+\left(xz^2+yz^2\right)+\left(xy^2+x^2y\right)=0\)

\(\Leftrightarrow yz\left(x+y\right)+xz\left(x+y\right)+z^2\left(x+y\right)+xy\left(x+y\right)=0\)

\(\Leftrightarrow\left(x+y\right)\left(yz+xz+xy+z^2\right)=0\)

\(\Leftrightarrow\left(x+y\right)\left(x+z\right)\left(y+z\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x+y\\x+z=0\end{cases}}=0\)  hoặc y+z=0

Do đó ta có B=0

2012 + 2013 x 2014 / 2014 x 2015 -2016 = 1 

mình trả lời đầu tiên nha

bn giải tri tiết giùm mình được không

2013 x 2014 +2012 / 2015 x2015 -2016=4054182+2012 / 4058210 - 2016= 4056194/4056194=1