1.△ABC中,AD是BC上的高,AE平分∠BAC,∠B=75°,∠C=45°,求∠DAE与∠AEC的度数.2.AB‖CD,若AB=4CM,△ABC的面积=12CM²,求△ABD中AB边上的高!3.已知A.B.C为△ABC的三边,且满足关系式|2a-b-1|+(a-2)²=2,若C为偶
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![1.△ABC中,AD是BC上的高,AE平分∠BAC,∠B=75°,∠C=45°,求∠DAE与∠AEC的度数.2.AB‖CD,若AB=4CM,△ABC的面积=12CM²,求△ABD中AB边上的高!3.已知A.B.C为△ABC的三边,且满足关系式|2a-b-1|+(a-2)²=2,若C为偶](/uploads/image/z/9459135-63-5.jpg?t=1.%E2%96%B3ABC%E4%B8%AD%2CAD%E6%98%AFBC%E4%B8%8A%E7%9A%84%E9%AB%98%2CAE%E5%B9%B3%E5%88%86%E2%88%A0BAC%2C%E2%88%A0B%3D75%C2%B0%2C%E2%88%A0C%3D45%C2%B0%2C%E6%B1%82%E2%88%A0DAE%E4%B8%8E%E2%88%A0AEC%E7%9A%84%E5%BA%A6%E6%95%B0.2.AB%E2%80%96CD%2C%E8%8B%A5AB%3D4CM%2C%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%3D12CM%26sup2%3B%2C%E6%B1%82%E2%96%B3ABD%E4%B8%ADAB%E8%BE%B9%E4%B8%8A%E7%9A%84%E9%AB%98%213.%E5%B7%B2%E7%9F%A5A.B.C%E4%B8%BA%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%E5%85%B3%E7%B3%BB%E5%BC%8F%7C2a-b-1%7C%2B%28a-2%29%26sup2%3B%3D2%2C%E8%8B%A5C%E4%B8%BA%E5%81%B6)
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