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Xét tính chẵn lẻ của hàm số: 1) $y_{}$ = $\dfrac{x^2-2|x|+2}{x+4}$ 2) $y_{}$ = $\dfrac{\sqrt{3+x}-\sqrt{3-x}}{x}$ 3) $y_{}$ = $\dfrac{x^5}{|x|^3
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