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设 f(x) = x^2sin(1/x) (当 x != 0 )且 f(0) = 0 。证明 。(答:使用夹挤定理 — 。)
设 f(x) = x^2sin(1/x) (当 x != 0 )且 f(0) = 0 。证明 。(答:使用夹挤定理 — 。)
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