题目列表(包括答案和解析)
7. Her behaviour is (不正常的) for a girl of three years old.
6. We waited with (焦急) for the news of her safe arrival.
5. Burners Li could have been extremely (富有) because of his invention of Web,but he isn’t.
4. Early to bed and early to rise is a (健康的) way of living.
3. The house is not really (合适) for a large family.
2. He ran so fast that he had no b left.
1. He fell off the ladder and had serious i .
26.小明将一张矩形纸片沿对角线剪开,得到两张全等直角三角形纸片(如图2),量得他们的斜边长为10cm,较小锐角为30°,再将这两张三角纸片摆成如图3的形状,使点B、F、D在同一条直线上,F为公共直角顶点。然后小明又将图(3)中的△ABF沿直线AF翻折到图(4)的位置,点B落在FD边上的B1点,AB1交DE于点H。
请你说明:(1)AH=DH.;(2)点H在∠AFD的角平分线上。
25.如图,在△ABC中, D、E分别是AC、AB上的点, BD与CE交于点O. 给出下列三个条件:①∠EBO=∠DCO;②∠BEO=∠CDO;③BE=CD.
(1)上述三个条件中, 哪两个条件可判定△ABC是等腰三角形(用序号写出所有情形);
(2)选择第⑴小题中的一种情形, 证明△ABC是等腰三角形.
24.如图,在中,是上一点,交于点,,,与有什么位置关系?证明你的结论.
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