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	Các bình luận về: Cho hàm số $ y=f\left( x \right)$ có đạo hàm và liên tục trên đoạn $\left[ -1;1 \right]$, thỏa $ f\left( x \right)&gt;0,\forall x\in \mathbb{R};$ và $ f&#8217;\left( x \right)+2f\left( x \right)=0$. Biết $ f\left( 1 \right)=1.$ Tính $ f\left( -1 \right).$	</title>
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