山东省德州市2019年中考数学一轮复习第四章图形的认识与三角形第15讲等腰三角形与直角三角形(过预测)练习.doc

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1等腰三角形与直角三角形考向 直角三角形的性质12018湖州如图,已知在ABC 中,BAC90,点 D为 BC的中点,点 E在 AC上,将CDE 沿 DE折叠,使得点 C恰好落在 BA的延长线上的点 F处,连接 AD,则下列结论不一定正确的是 ( C )AAEEF BAB2DECADF 和ADE 的面积相等 DADE 和FDE 的面积相等第 1题图 第 2题图22018常德如图,已知 BD是ABC 的角平分线,ED 是 BC的垂直平分线,BAC90,AD3,则 CE的长为( D )A6 B5 C4 D3 332018泰州如图,四边形 ABCD中,AC 平分BAD,ACDABC90,E、F分别为 AC、CD 的中点,D,则BEF 的度数为 2703(用含 的式子表示)考向 等腰三角形、直角三角形的综合运用42018东营如图,点 E在DBC 的边 DB上,点 A在DBC 内部,DAEBAC90,ADAE,ABAC.给出下列结论:BDCE;ABDECB45;BDCE;BE 22(AB 2AD 2)CD 2.其中正确的是( A )A B C D 2

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