反证法证明题
例1.已知<Object: word/embeddings/oleObject1.bin>
,<Object: word/embeddings/oleObject2.bin>
,<Object: word/embeddings/oleObject3.bin>
为<Object: word/embeddings/oleObject4.bin>
内角.求证:<Object: word/embeddings/oleObject5.bin>
,<Object: word/embeddings/oleObject6.bin>
,<Object: word/embeddings/oleObject7.bin>
中至少有一个不小于
60o.证明:假设
<Object: word/embeddings/oleObject8.bin>
的三个内角
<Object: word/embeddings/oleObject9.bin>
,<Object: word/embeddings/oleObject10.bin>
,<Object: word/embeddings/oleObject11.b ...


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