Quiz 9：極限存在的條件 \(f(x) = \left\{ {\begin{array}{*{20}{c}}{\;\;x\;,\;if\;x\;is\;rational}\\{ - x\;,if\;x\;is\;irrational}\end{array}} \right.\) 則極限 \(\lim\limits_{x \to {\rm{1}}} f(x)\) ?
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Quiz 9：極限存在的條件 \(f(x) = \left\{ {\begin{array}{*{20}{c}}{\;\;x\;,\;if\;x\;is\;rational}\\{ - x\;,if\;x\;is\;irrational}\end{array}} \right.\) 則極限 \(\lim\limits_{x \to {\rm{1}}} f(x)\) ?
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