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26 tháng 2 2017

Dat  (x-y)2+(y-z)2+(x-z)2=A

=(x+y)3+z3-3x2y-3xy2-3xyz / A

=(x+y+z).(x2+2xy+y2-xy-yz+z2)-3xy(x+y+z) / A

=(x+y+z).(x2+y2+z2-xy-yz-xz) /A

=2(x+y+z).(x2+y2+z2-xy-yz-xz) /2A 

=(x+y+z)[ (x2-2xy+y2)+(y2-2yz+z2)+(x2-2xz+z2) / 2A

=(x+y+z).[ (x-y}2+(y-z)2+(x-z)] /2A

=(x+y+z). A /2A

=x+y+z /2

26 tháng 2 2017

kimh thế

DD
8 tháng 10 2021

\(x^3+y^3+z^3-3xyz=\left(x+y\right)^3-3xy\left(x+y\right)+z^3-3xyz\)

\(=\left(x+y+z\right)^3-3\left(x+y\right)z\left(x+y+z\right)-3xy\left(x+y+z\right)\)

\(=\left(x+y+z\right)\left[\left(x+y+z\right)^2-3xy-3yz-3zx\right]\)

\(=\left(x+y+z\right)\left(x^2+y^2+z^2-xy-yz-zx\right)\)

\(=\frac{1}{2}\left(x+y+z\right)\left(x^2-2xy+y^2+y^2-2yz+z^2+z^2-2zx+x^2\right)\)

\(=\frac{1}{2}\left(x+y+z\right)\left[\left(x-y\right)^2+\left(y-z\right)^2+\left(z-x\right)^2\right]\)

Suy ra \(\frac{x^3+y^3+z^3-3xyz}{\left(x-y\right)^2+\left(y-z\right)^2+\left(z-x\right)^2}=\frac{1}{2}\left(x+y+z\right)\)

20 tháng 11 2016

\(\frac{x^3-y^3+z^3+3xzy}{\left(x+y\right)^2+\left(y+z\right)^2+\left(z-x\right)^2}\)

\(=\frac{\left(x-y\right)^3+z^3+3x^2y-3xy^2+3xyz}{2x^2+2y^2+2z^2+2xy+2yz-2xz}\)

\(=\frac{\left(x-y+z\right)\left[\left(x-y\right)^2+z^2-\left(x-y\right)z\right]+3xy\left(x-y+z\right)}{2\left(x^2+y^2+z^2+xy+yz-xz\right)}\)

\(=\frac{\left(x-y+z\right)\left[x^2+y^2-2xy+z^2-xz+yz+3xy\right]}{2\left(x^2+y^2+z^2+xy+yz-xz\right)}\)

\(=\frac{\left(x-y+z\right)\left(x^2+y^2+z^2+xy+yz-xz\right)}{2\left(x^2+y^2+z^2+xy+yz-xz\right)}\)

\(=\frac{x-y+z}{2}\)

8 tháng 12 2017

x3y3+z3+3xzy(x+y)2+(y+z)2+(zx)2 

=(xy)3+z3+3x2y3xy2+3xyz2x2+2y2+2z2+2xy+2yz2xz 

=(xy+z)[(xy)2+z2(xy)z]+3xy(xy+z)2(x2+y2+z2+xy+yzxz) 

=(xy+z)[x2+y22xy+z2xz+yz+3xy]2(x2+y2+z2+xy+yzxz) 

=(xy+z)(x2+y2+z2+xy+yzxz)2(x2+y2+z2+xy+yzxz) 

=xy+z2 

4 tháng 11 2018

\(=\frac{\left(x+y+z\right)\left(x^2+y^2+z^2-xy-yz-zx\right)}{x^2-2xy+y^2+y^2-2yz+z^2+z^2-2zx+x^2}=\frac{\left(x+y+z\right)\left(x^2+y^2+z^2-xy-yz-zx\right)}{2\left(x^2+y^2+z^2-xy-yz-zx\right)}=\frac{x+y+z}{2}\)