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樓上的解答不正確. 本題用洛必達求解,永遠迴圈,無法解出,而必須使用半型公式. 如果做 ;&;frac12; ;x&;sup2; ; ;代換,是可以的. 極限不存在是因為左極限等於右極限,而不是代換的原因. 點擊放大,螢屏放大再放大:
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