violimpi 8 vong 15

T

tiendat102

Thay 2010=xyz Ta được :
[TEX]A=\frac{x^2yz}{xy+x^2yz+xyz}+[/TEX][TEX]\frac{y}{yz+y+xyz}+\frac{z}{xz+z+1}[/TEX]

[TEX]A=\frac{x^2yz}{xy(xz+z+1)}+[/TEX][TEX]\frac{y}{y(xz+z+1)}+\frac{z}{xz+z+1}[/TEX]

[TEX]A=\frac{xz}{xz+z+1}+[/TEX][TEX]\frac{1}{xz+z+1}+\frac{z}{xz+z+1}[/TEX]

[TEX]A=\frac{xz+1+z}{xz+z+1}[/TEX]

[TEX]A=1[/TEX]
 
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