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更新时间:2022-04-10 16:43:50
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【推荐1】如图,平面内点
,
沿同一方向,平移相同距离分别得到点
,
,连接
,
,延长
到点
,连接
,
,
恰好平分
.
,
,求
的度数;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040014a609bb4c2c2f16f223467e4871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86782e6cec93c18b4a6a0465c69a249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359bc7a47c723102813220ef7283177.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325ce44c1201d3e51caddda9ef2693c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53df2a88f461611f7159d0f2f8ef60e.png)
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【推荐2】如图所示,△ABC中,AB=BC,DE⊥AB于点E,交AC于D,EF⊥BC于点F.
(1)若∠CDE=152°,求∠DEF的度数;
(2)若点D是AC的中点,求证:
.
(1)若∠CDE=152°,求∠DEF的度数;
(2)若点D是AC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d9939cca7d4ec937f709ffc5ce7abb.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644603694989312/2645010393489408/STEM/0e94a396-a64b-4e6d-ad15-421c0ef1580f.png)
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【推荐1】(1)在
中,
,已知
,
,求
,a,b;
(2)如图,在
中,
,
,D为AC上一点,
,
.求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5ff409e0514a2528df660eb4251f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee608882881caff2f1e223177424ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5489aaa6dc00789fcf126bf2fd744a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/00c666f8-fcc3-40a5-bf48-76326123cc70.png?resizew=157)
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【推荐2】在矩形
中,
.
上确定点E,使
.再在
上确定点F,使以F为圆心的圆经过点E和点C.
(2)在(1)的条件下,若
,且
,则
的长为_____(如需要画草图请使用试卷中的备用图).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4664ae2f4575127160b8701ef99e9641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】一艘轮船向正东方向航行,在A处测得灯塔C在A的北偏东
方向,航行60海里到达B处,此时测得灯塔C在B的北偏东
方向上.求A到灯塔C的距离
(结果精确到1海里,参考数据:
,
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225803a7818b0985a1b96d8e0a627251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86655128e3edff5ee21d2f05cfc2c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11735634a66826b0e49a9bcb3ca908d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f58dfdfaa9f4eaac353384f2512893.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/890b8fc1-228d-4038-a3c0-3b16f6b80400.png?resizew=160)
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【推荐2】已知:如图,等腰△ABC中,AB=BC,AE⊥BC于E,EF⊥AB于F,若CE=2,cos∠AEF=
,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba564f8149fb98ee50c4012f06708382.png)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101787333566464/2102970184949760/STEM/cbfb6124dace4a0c844455a7f76c3f47.png?resizew=171)
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【推荐1】如图,在□
中,连接AC,点E是AB中点,点F是AC的中点,连接EF,过E作EG∥AF,交DA的延长线于点G.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731374592/STEM/e19966ca-070b-402f-b0b1-d41f221565fb.png?resizew=232)
(1)求证:四边形AGEF是平行四边形;
(2)若
,
,
,连接GF,求GF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731374592/STEM/e19966ca-070b-402f-b0b1-d41f221565fb.png?resizew=232)
(1)求证:四边形AGEF是平行四边形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3444727c95074bf2ea9487660f04014a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
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【推荐3】走进南泥湾党徽广场,迎面而来的是一个巨大的党徽雕塑,党徽雕塑传承红色精神。如图①是雕塑的实物图,图②是其测量示意图,首先点C处用测倾器测得雕塑顶端A点的仰角为60°,然后在另一侧D点用测倾器测得雕塑顶端A点的仰角为37°,已知A,B,C,D,E,F,G在同一平面内,E,F两点间的距离为22.9m,测倾器的高度CE=DF=1.8m,求该雕塑的高度AB.(结果精确到0.1m,参考数据:sin37°≈0.6,cos37°≈0.8,tan37°≈0.75,
≈1.73)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967310068965376/2970927061999616/STEM/9e26b1e3-9782-4685-8a0d-8b75b12d85ba.png?resizew=398)
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