如图所示:在△ABC中,AD、BE、CF分别为∠BAC、∠ABC、∠ACB的平分线,交于点O.1:若∠BAC=70°,∠3=40°,求∠ABC的度数;2:求∠1+∠2+∠3的度数;3:若∠BAC=70°,求∠BOC的度数
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![如图所示:在△ABC中,AD、BE、CF分别为∠BAC、∠ABC、∠ACB的平分线,交于点O.1:若∠BAC=70°,∠3=40°,求∠ABC的度数;2:求∠1+∠2+∠3的度数;3:若∠BAC=70°,求∠BOC的度数](/uploads/image/z/5199189-69-9.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%3A%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAD%E3%80%81BE%E3%80%81CF%E5%88%86%E5%88%AB%E4%B8%BA%E2%88%A0BAC%E3%80%81%E2%88%A0ABC%E3%80%81%E2%88%A0ACB%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E4%BA%A4%E4%BA%8E%E7%82%B9O.1%EF%BC%9A%E8%8B%A5%E2%88%A0BAC%3D70%C2%B0%2C%E2%88%A03%3D40%C2%B0%2C%E6%B1%82%E2%88%A0ABC%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%9B2%EF%BC%9A%E6%B1%82%E2%88%A01%2B%E2%88%A02%2B%E2%88%A03%E7%9A%84%E5%BA%A6%E6%95%B0%3B3%EF%BC%9A%E8%8B%A5%E2%88%A0BAC%3D70%C2%B0%2C%E6%B1%82%E2%88%A0BOC%E7%9A%84%E5%BA%A6%E6%95%B0)
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