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成立. 用反證法: 反設,若角1=角2,則它們可能是對頂角. 則180-角1=180-角2(同角的補角相等),得角1=角2,與題設不符. 所以命題成立. 事實上,這個命題與“相等的角是對頂角”等價.
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