已知
,
,
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b98e1a076e94a517bfd651514e948ad.png)
(1)求
,
,
的值.
(2)试问以
,
,
为边能否构成三角形?若能构成三角形,请求出三角形的周长;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b98e1a076e94a517bfd651514e948ad.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
(2)试问以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
更新时间:2022-10-24 16:42:47
|
相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系中,已知
,
,
三点,其中
满足关系式:
.
(1)求
的值;
(2)请直接判断
与y轴的位置关系;
(3)若平面内有一点
,且点P到
的距离为5,请求出
的面积;
(4)如果点
在第二象限内,是否存在负整数m,使四边形
的面积不小于
面积的3倍?若存在,请直接写出所有满足条件的点P的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208c4a5a23aa63572885feb26ec2aa14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce4d182ef7c0ffa093eb9d2b19e43cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/428ad975-51d7-498d-9c10-a6d68f3f7b67.png?resizew=229)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
(2)请直接判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)若平面内有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3767a206cdebb1f832e796058b42a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
(4)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3767a206cdebb1f832e796058b42a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704d08fe16b2be56a17340ec0342ae8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
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【推荐2】已知
与
互为相反数,z是绝对值最小的有理数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18fe3b48f201a6c9969bb69d63dd042d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5646bd5538fe4df5ab0b412e2fb20ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5837de87d26171fc57a533970d611021.png)
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【推荐3】同学们都知道:
表示5与
之差的绝对值,实际上也可理解为5与
两数在数轴上所对应的两点之间的距离.请你借助数轴进行以下探索:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/993be984-c5a5-4261-8339-af900ce21da7.png?resizew=514)
(1)已知点A在数轴上对应的数为a,点B在数轴上对应的数为b,且
,则
___________,
___________,点A和点B之间的距离为___________.
(2)设点Р在数轴上对应的数为
,若
,则
___________.
(3)如图,点M,N,P是数轴上的三点,点M表示的数为4,点N表示的数为
,动点Р表示的数为x.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/9aaa01da-f049-4097-95cf-277e1b9a85e9.png?resizew=449)
①若点Р在点M、N之间,则
___________.
②若点Р表示的数是
,现在有一蚂蚁从点Р出发,以每秒1个单位长度的速度向右运动,当经过多少秒时,蚂蚁所在的点到点M、点N的距离之和是8?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ba690de4bdbdceb968265181a208f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/993be984-c5a5-4261-8339-af900ce21da7.png?resizew=514)
(1)已知点A在数轴上对应的数为a,点B在数轴上对应的数为b,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a441f0740087d0b22dd302c1515b5ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)设点Р在数轴上对应的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4784ce39d25d5b2a2c9f3713e4abbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(3)如图,点M,N,P是数轴上的三点,点M表示的数为4,点N表示的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29418e5014731850c55565b6bf47aa41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/9aaa01da-f049-4097-95cf-277e1b9a85e9.png?resizew=449)
①若点Р在点M、N之间,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e093018d5ac8c8bee584b70c4fd8c629.png)
②若点Р表示的数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
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【推荐1】已知a、b满足
,解关于x的方程(a+2)x+4b=a+2.
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574195435143168/1574195441664000/STEM/5b709612dde245848b9c024f30e89f6d.png)
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解答题-计算题
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【推荐1】有这样一类题目:将
化简,如果你能找到两个数m、n,使
并且
,则将
变成
开方,从而使得
化简.
例如:化简
.
解:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e316a5308f1b05d8bee68423213d7a25.png)
.
根据上述材料化简下列各式:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79302e44ec001a6f493b466325e0e5aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e30fe2547f71f7505e99a0dd7188e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562c62e0442121011d12f10234b95119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9952886d3fd60ef715bce5643c2f1bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8951d55c30bac2a26765a38a87368bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79302e44ec001a6f493b466325e0e5aa.png)
例如:化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f52a49827b10ed69c411a4fc24b7ea.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e316a5308f1b05d8bee68423213d7a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65270e9df426a0a5a3c70727d87aa6c.png)
根据上述材料化简下列各式:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3095711cd322936f0cb8c9d990a0e6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02c5f0d8844328cea41d882c219b8fb.png)
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【推荐1】在等腰三角形
中
,一腰上的中线
把这个三角形的周长分为
和
两部分,求这个等腰三角形的底边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce710269ec0786472cad1bb73ee7d3ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
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【推荐2】数学兴趣小组在探讨全等三角形相关问题的解决方法时发现:当条件中出现“中线”或“中点”时,可考虑倍长中线或作一条边的平行线来解决问题.
中,
,
,
为
边上的中线,则
的取值范围为__________.
(2)【类比分析】如图2:在
中,
,
,
是
的中线,
于点C,
且
.求
的长度.
(3)【拓展延伸】如图3:在
中,
于点F,在
右侧作
于点A,且
,在
左侧作
于点A,且
,连接DE,延长
交
于点O.求证:点O为
中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)【类比分析】如图2:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531d6f90f144551a35d494b1fe7d2b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a284cedefae0e06c3b6b4b4f7babe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)【拓展延伸】如图3:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐3】阅读下列一段文字,然后回答下列问题.已知在平面内两点
、
,其两点间的距离
,同时,当两点所在的直线在坐标轴或平行于坐标轴或垂直于坐标轴时,两点间距离公式可简化为
或
.
(1)已知
、
,试求A、B两点间的距离;
(2)已知A、B在平行于y轴的直线上,点A的纵坐标为4,点B的纵坐标为
,试求A、B两点间的距离;
(3)已知一个三角形各顶点坐标为
、
、
,你能判定此三角形的形状吗?说明理由;
(4)在(3)的条件下,平面直角坐标系中,在坐标轴上找到一点,使得
是以
为底的等腰三角形,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b8ae26c446d54f456a4f9b2f28d091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6abf3f9b0ebcdc47a028c781b7edb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea85462de4f0c3de7b8f47242a3102b.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b2cc0d2f6d3eee9a33db83e0c0830d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3355d436341d161584eca56624f7ee8.png)
(2)已知A、B在平行于y轴的直线上,点A的纵坐标为4,点B的纵坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(3)已知一个三角形各顶点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5a49b8191e84cc70e5eb8c7dd626b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779946293a751ce4b9b4ba54b9b2cd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d63512e7c44c577a72ca80898690b.png)
(4)在(3)的条件下,平面直角坐标系中,在坐标轴上找到一点,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95558cdc4ce1e6d9462d2e91c070655f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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