如图,在
中,
,点D是
的中点,连接
,过点B作
,过点C作
,
相交于点E.
是菱形;
(2)过点D作
于点F,交
于点G,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41f2f95d643629321deb6e905c4f1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1addb345549acae4fe1ffe338516d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0861a397742dd3b40ab10488e7fa3e.png)
(2)过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1893d78af450a5fa09810537adc2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17698c8570edfe7a2ecca24a424f4b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
更新时间:2024-05-27 11:50:14
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
是边
上的中线,E是边
上一点,过点C作
交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/0098de5c-80c8-48bb-8e08-9d67518b3d3d.png?resizew=219)
(1)求证:
.
(2)当
于点D,
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/0098de5c-80c8-48bb-8e08-9d67518b3d3d.png?resizew=219)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe3dc2fc31839eac5a78e1e3d8adda3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60572975f9ac06ffc8d98ef94de49eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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|
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【推荐2】已知△ABC中,∠ABC=90゜,AB=BC,点A、B分别是x轴和y轴上的一动点.
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/6f1382f7-4087-4c1d-865c-cc0b7276cf89.png?resizew=213)
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/f887f6f4-29fb-44a5-bbe5-dd2462f1663c.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/f6fb1e4e-9822-4438-ace0-6a9f433ba111.png?resizew=173)
(1)如图1,若点C的横坐标为-4,求点B的坐标;
(2)如图2,BC交x轴于D,AD平分∠BAC,若点C的纵坐标为3,A(5,0),求点D的坐标.
(3)如图3,分别以OB、AB为直角边在第三、四象限作等腰直角△OBF和等腰直角△ABE,EF交y轴于M,求 S△BEM:S△ABO.
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/6f1382f7-4087-4c1d-865c-cc0b7276cf89.png?resizew=213)
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/f887f6f4-29fb-44a5-bbe5-dd2462f1663c.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2013/12/17/1573690681761792/1573690687979520/STEM/f6fb1e4e-9822-4438-ace0-6a9f433ba111.png?resizew=173)
(1)如图1,若点C的横坐标为-4,求点B的坐标;
(2)如图2,BC交x轴于D,AD平分∠BAC,若点C的纵坐标为3,A(5,0),求点D的坐标.
(3)如图3,分别以OB、AB为直角边在第三、四象限作等腰直角△OBF和等腰直角△ABE,EF交y轴于M,求 S△BEM:S△ABO.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图①,点M、N分别是正方形
的边
的中点,连接
.
(1)判断
的数量关系与位置关系,并说明理由;
(2)如图②,设
的交点为H,连接
,求证:
是等腰三角形;
(3)将
沿
翻折得到
,延长
交
的延长线于点E,如图③,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31174daf67e27a7d538860aa793a0f9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/f7ec333a-5010-491e-8e7a-9763972b7e0b.png?resizew=361)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31174daf67e27a7d538860aa793a0f9e.png)
(2)如图②,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31174daf67e27a7d538860aa793a0f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6629fbe2eef7def1afa88acbbabdb10.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee9bc57f1a415b5790b5b40854c832e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c914bcb96577151fc67df6039eecc2.png)
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名校
【推荐2】如图,在
中,
,
,将
绕点
顺时针旋转
,得到
,连接
,交
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815674249216/2901360891715584/STEM/b4042e6c-e1a0-4bcd-bf7f-befa23e668e1.png?resizew=137)
(1)求
的长
(2)当
、
、
三点共线时,此时的旋转角度数是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbecefd7b93a291d0d47ed630f51493a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815674249216/2901360891715584/STEM/b4042e6c-e1a0-4bcd-bf7f-befa23e668e1.png?resizew=137)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐1】实践与探究题
问题:直角三角形除了三边之间、两个锐角之间有特殊的关系外,斜边上的中线有什么性质呢?
丽丽同学利用直角三角形纸片进行了如下的折叠实验:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/df36dbbe-9cd4-4418-b222-5589a24b962f.png?resizew=651)
(1)观察发现
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/d7c9d070-c191-43f3-b876-c6ec66b3a762.png?resizew=98)
① 观察丽丽同学的折叠实验,你发现线段CD与AB之间有何数量关系?在图(1)所示的Rt△ ABC中,∠C=90°,CD是斜边AB上中线.请根据图(1)证明你的猜想.
② 根据上面的探究,总结直角三角形斜边上的中线性质.
(2)拓展应用:如图(2),CD是Rt△ ABC的斜边AB上的高,若CD=5,则Rt△ ABC面积的最小值等于______.
问题:直角三角形除了三边之间、两个锐角之间有特殊的关系外,斜边上的中线有什么性质呢?
丽丽同学利用直角三角形纸片进行了如下的折叠实验:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/df36dbbe-9cd4-4418-b222-5589a24b962f.png?resizew=651)
(1)观察发现
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/d7c9d070-c191-43f3-b876-c6ec66b3a762.png?resizew=98)
① 观察丽丽同学的折叠实验,你发现线段CD与AB之间有何数量关系?在图(1)所示的Rt△ ABC中,∠C=90°,CD是斜边AB上中线.请根据图(1)证明你的猜想.
② 根据上面的探究,总结直角三角形斜边上的中线性质.
(2)拓展应用:如图(2),CD是Rt△ ABC的斜边AB上的高,若CD=5,则Rt△ ABC面积的最小值等于______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/0c1193b7-190d-494b-b06b-97f103637ed6.png?resizew=177)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
是
边上的高,
是
边上的中线,
于
,
.
![](https://img.xkw.com/dksih/QBM/2022/12/3/3122482599632896/3127120873725952/STEM/161d9756bb0644f486a6a26e04a9fc10.png?resizew=166)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1893d78af450a5fa09810537adc2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8fb32ae05a9c1abd3374f5c5f7a999.png)
![](https://img.xkw.com/dksih/QBM/2022/12/3/3122482599632896/3127120873725952/STEM/161d9756bb0644f486a6a26e04a9fc10.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】阅读资料:如图1,在平面之间坐标系
中,
,
两点的坐标分别为
,
,由勾股定理得
,所以
,
两点间的距离为
.我们知道,圆可以看成到圆心距离等于半径的点的集合,如图2,在平面直角坐标系
中,
为圆上任意一点,则
到原点的距离的平方为
,当
的半径为
时,
的方程可写为:
.
问题拓展:如果圆心坐标为
,半径为
,那么
的方程可以写为
.
综合应用:如图3,
与
轴相切于原点
,
点坐标为
,
是
上一点,连接
,使
,作
,垂足为
,延长
交
轴于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963653603803136/2965056281772032/STEM/ec11ecf4-2cf0-4148-96cf-6f6d017497ba.png?resizew=523)
(1)求证
是
的切线;
(2)是否存在到四点
,
,
,
距离都相等的点
?若存在,求
点坐标,并写出以
为圆心,以
为半径的
的方程;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](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/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb383bd13fb570190997e276cd46a9b.png)
![](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/2fa214e77f478029fa3472d0caef749b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f109ad046f362d8686c7ef9810c568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfcaa64eca6e5551eb3d5d961b23d88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3503d330608e7138d1b529aba4512fa.png)
问题拓展:如果圆心坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d7c223faadd624d524399fc0f7f39e.png)
综合应用:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f2be8f1e796226f1b0fa95f6aea35d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83415192710f1571ed9d0b233cc735ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963653603803136/2965056281772032/STEM/ec11ecf4-2cf0-4148-96cf-6f6d017497ba.png?resizew=523)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
(2)是否存在到四点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图1,两个全等的直角三角板ABC和DEF重叠在一起,其中∠ACB=∠DFE=90°,∠A=60°,AC=1,固定△ABC,将△DEF沿线段AB向右平移(即点D在线段AB上),回答下列问题:
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243905631698944/2244575946530816/STEM/a32aaec19a5b4a0f902c5d3715bd34f1.png?resizew=471)
(1)如图2,连结CF,四边形ADFC一定是 形.
(2)连接DC,CF,FB,得到四边形CDBF.
①如图3,当点D移动到AB的中点时,四边形CDBF是 形.其理由?
②在△DEF移动过程中,四边形CDBF的形状在不断改变,但它的面积不变化,其面积为 .
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243905631698944/2244575946530816/STEM/a32aaec19a5b4a0f902c5d3715bd34f1.png?resizew=471)
(1)如图2,连结CF,四边形ADFC一定是 形.
(2)连接DC,CF,FB,得到四边形CDBF.
①如图3,当点D移动到AB的中点时,四边形CDBF是 形.其理由?
②在△DEF移动过程中,四边形CDBF的形状在不断改变,但它的面积不变化,其面积为 .
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,矩形
的对角线
、
交于点
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/9/13/2031510749495296/2036353784504320/STEM/8a838cc61d344bf68ac368b113c31be7.png?resizew=125)
证明:四边形
为菱形;
若
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171422a8a71a51391cf507379540231a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d45c9b0cba4c5e69eb1c86743c11435.png)
![](https://img.xkw.com/dksih/QBM/2018/9/13/2031510749495296/2036353784504320/STEM/8a838cc61d344bf68ac368b113c31be7.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99399ce175a0f5d0a7a6a82d81b6af7f.png)
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