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lta2151995


Cho a,b,c,x,y,z thoả mãn
[TEX]x=\frac{a-b}{a+b}[/TEX];[TEX]y=\frac{b-c}{b+c}[/TEX];[TEX]z=\frac{c-a}{c+a}[/TEX]
Tính [TEX]P=\frac{(1-x)(1-y)(1-z)}{(1+x)(1+y)(1+z)}[/TEX]
[TEX]x=\frac{a-b}{a+b}[/TEX];[TEX]y=\frac{b-c}{b+c}[/TEX];[TEX]z=\frac{c-a}{c+a}[/TEX]
Tính [TEX]P=\frac{(1-x)(1-y)(1-z)}{(1+x)(1+y)(1+z)}[/TEX]
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