The proof by contradiction is one of the most important methods of proving propositions in mathematics.

如何有效地提高和改进反证法的教学，是摆在中学数学教师面前的一个重要课题。

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The proof by contradiction is one of the most important methods of proving propositions in mathematics.

如何有效地提高和改进反证法的教学，是摆在中学数学教师面前的一个重要课题。

youdao