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由定義知limx->0 o(x^2)/x^2=0 limx->0 [o(x^2)+o(x^2)]/x^2=limx->0 o(x^2)/x^2+limx->0 o(x^2)/x^2=0+0=0 o(x^2)+o(x^2)=o(x^2)
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