Tìm các giá trị x,y,z:Hay Lắm

D

duynhan1

[TEX]\sqrt{x-2}+\sqrt{y+2006}+\sqrt{z-2007}=1/2(x+y+z)[/TEX] .

[TEX]\Leftrightarrow 2\sqrt{x-2}+2\sqrt{y+2006}+2\sqrt{z-2007}=x+y+z[/TEX]

[TEX]\Leftrightarrow (x- 2 +2\sqrt{x-2} + 1) + (y + 2006+2\sqrt{y+2006}+1) + ( z - 2007 +2\sqrt{z-2007} + 1) = 0 [/TEX]

[TEX]\Leftrightarrow (\sqrt{x-2}-1)^2+(\sqrt{y+2006}-1)^2+(\sqrt{z-2007}-1)^2 = 0 [/TEX]

"=" .................
 
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