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∠1=∠2,∠3=∠4,三角形abc是等腰三角形.說明,∠1與∠2,∠3與∠4是等腰的兩個內角或外角.,∠A有86°,不能是其他兩個等腰角,只能是頂角.那麼,∠1=∠2=47°或133°,∠3=∠4=133°或47°,∠5=94°
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