如图,在
,
,该三角形的三个顶点均在坐标轴上.二次函数
过
.
(1)求二次函数的解析式;
(2)点
为该二次函数第一象限上一点,当
的面积最大时,求
点的坐标;
(3)
为二次函数上一点,
为
轴上一点,当
成的四边形是平行四边形时,直接写出
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330c1d67129914bb5346a4ff6ee1832c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/226ae439-d59c-4445-a4cd-0ff5aac3fdd4.jpg?resizew=156)
(1)求二次函数的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040a361ef61b0afd4a58f663f97f40ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
更新时间:2023-09-23 10:01:07
|
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【推荐1】如图1所示,直线l:y=mx+5m与x轴负半轴,y轴正半轴分别交于A、B两点.
(1)当OA=OB时,求直线l的解析式;
(2)在(1)的条件下,如图2所示,设Q线段AB延长线上一点,作直线OQ,过A、B两点分别作AM⊥OQ于点M,BN⊥OQ于点N,若AM=4,求MN的长;
(3)如图3,当m取不同的值时,点B在y轴正半轴上运动,分别以OB、AB为边,点B为直角顶点在第一、二象限内作等腰直角△OBF和等腰直角△ABE,连接EF交y轴于P点,当点B在y轴正半轴上运动时,试猜想△ABP的面积是否改变;若不改变,请求出其值;若改变,请说明理由;
(4)如图3,当m取不同的值时,点B在y轴正半轴上运动,以B为边在第二象限作等直角△ABE,则动点E在直线 上运动(直接写出直线的解析式).
(1)当OA=OB时,求直线l的解析式;
(2)在(1)的条件下,如图2所示,设Q线段AB延长线上一点,作直线OQ,过A、B两点分别作AM⊥OQ于点M,BN⊥OQ于点N,若AM=4,求MN的长;
(3)如图3,当m取不同的值时,点B在y轴正半轴上运动,分别以OB、AB为边,点B为直角顶点在第一、二象限内作等腰直角△OBF和等腰直角△ABE,连接EF交y轴于P点,当点B在y轴正半轴上运动时,试猜想△ABP的面积是否改变;若不改变,请求出其值;若改变,请说明理由;
(4)如图3,当m取不同的值时,点B在y轴正半轴上运动,以B为边在第二象限作等直角△ABE,则动点E在直线 上运动(直接写出直线的解析式).
![](https://img.xkw.com/dksih/QBM/2022/1/8/2889836363259904/2890606627962880/STEM/7b4ce8c5e34f48df89936759a870e0ff.png?resizew=550)
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【推荐2】如图,在直角坐标系中,直线BC经过点B(﹣4,0)和点C(0,3),A点坐标为(3,0),点P为直线BC上一点,连接AC、AP.
(1)求直线BC的解析式;
(2)如图1,当点P在线段BC上,∠APC=45°时,求P点坐标;
(3)如图2,当点P在直线BC上移动,将△APC沿AC翻折得到△AP′C,直线AP′与直线BC交于点D,△DCA的面积为7,求点D坐标(直接写出结果).
(1)求直线BC的解析式;
(2)如图1,当点P在线段BC上,∠APC=45°时,求P点坐标;
(3)如图2,当点P在直线BC上移动,将△APC沿AC翻折得到△AP′C,直线AP′与直线BC交于点D,△DCA的面积为7,求点D坐标(直接写出结果).
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【推荐1】如图,抛物线
与x轴交于A,B两点,与y轴交于点C,抛物线的对称轴交x轴于点D,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/2ea1fb6f-3c54-4434-90b7-e938d63125e5.png?resizew=275)
(1)求抛物线的表达式;
(2)在抛物线的对称轴上是否存在点P,使
是等腰三角形?如果存在,求出P点的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373c54873d49e0645c533ab2dcc44ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f845a7c69953429bd6228ac76f6848ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/2ea1fb6f-3c54-4434-90b7-e938d63125e5.png?resizew=275)
(1)求抛物线的表达式;
(2)在抛物线的对称轴上是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
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名校
【推荐2】在平面直角坐标系
中,二次函数
的图象经过原点.
![](https://img.xkw.com/dksih/QBM/2023/2/14/3174435953000448/3174526179975168/STEM/524f0ef120f64606a845ec40c821a041.png?resizew=177)
(1)求该二次函数的解析式以及顶点坐标;
(2)将该二次函数的图象在y轴左侧的部分记作W,将W绕原点旋转
得到
,W与
组成一个新函数的图象.
①若点
在该新函数图象上,求b的值;
②若点
是新函数图象上两点,若存在
,使得
,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d62766ce842a8d584be918c38ab264e.png)
![](https://img.xkw.com/dksih/QBM/2023/2/14/3174435953000448/3174526179975168/STEM/524f0ef120f64606a845ec40c821a041.png?resizew=177)
(1)求该二次函数的解析式以及顶点坐标;
(2)将该二次函数的图象在y轴左侧的部分记作W,将W绕原点旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c6b27c5926ec76c47ebe9dd9c49423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c6b27c5926ec76c47ebe9dd9c49423.png)
①若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74afbf2dc6c0ece67ee7974a1f450bfc.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154e7b5f5f6845edc05b9962b595a22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e6ef720aa2728f1ff7dd6760039711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
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【推荐1】如图,已知直线y=
x+b与y轴交于点B(0,﹣3),与反比例函数y=
(x>0)的图象交于点A,与x轴交于点C,BC=3AC
(1)求反比例函数的解析式;
(2)若P是y轴上一动点,M是直线AB上方的反比例函数y=
(x>0)的图象上一动点,直线MN⊥x轴交直线AB于点N,求△PMN面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6eb294f1e03122b715424e6b68cc99.png)
(1)求反比例函数的解析式;
(2)若P是y轴上一动点,M是直线AB上方的反比例函数y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6eb294f1e03122b715424e6b68cc99.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/290d96cc-d24c-4935-bdd1-1dd9e35677ef.jpg?resizew=182)
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真题
【推荐2】如图,抛物线
与
轴交于
两点,与
轴的正半轴交于点
,其顶点为
.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/2e5b8e3a493f47368413957310ea3f39.png)
(1)写出
两点的坐标(用含
的式子表示);
(2)设
,求
的值;
(3)当
是直角三角形时,求对应抛物线的解析式.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/9ae01898fcc04cecbcb01ff2f6ea5275.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/748140775d41410abe97071959f3ca7d.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/8e5cf74eb7f8434aad533ea03d35515f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/72d395ce01f24a1d95443ead8fe4b554.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/497f905f598e45278efa6408f01e787e.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/6648117ace8f4391a97bdd90d7d3b288.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/2e5b8e3a493f47368413957310ea3f39.png)
(1)写出
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/e50c3bb5d16347a5af896052ed01f129.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/56bf30e0584b4cd09f418b210ea54a3f.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/8c1a41ad73cd4109af8c45f0018681f8.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/99728b1663ca47f4a4b118d335c00d1d.png)
(3)当
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762647220224/1773762647433216/STEM/e5d3054f4b5d4657baf9cc664f24795b.png)
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【推荐1】如图1,在平面直角坐标系中,二次函数
的图象与
轴交于点
和点
,与
轴交于点
,连接
,
.
(1)填空:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
,
,
;
(2)如图2,点
是线段
上方抛物线上的一个动点.过点
作
交线段
于点
,设点
的横坐标为
,记
.
①求
关于
的函数关系式;
②当
取
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187eb01e2fb739e4a48d7609748311b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8a05a8a16ce7236887298f90d8e140.png)
时,试比较
的对应函数值
和
的大小.
(3)如图3,直线
:
经过点
,点
是直线
上的动点,点
是
轴上的动点,点
是抛物线对称轴上的动点,当以
、
、
、
为顶点的四边形是菱形时,直接写出所有满足条件的点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/b2664596-8414-48bc-b87e-e9bf14b329da.jpg?resizew=431)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223afaf90a2d7f3cd1c5f2ec559791f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dc8f0387c840a92b256b48d87a001e.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187eb01e2fb739e4a48d7609748311b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8a05a8a16ce7236887298f90d8e140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226e10b63b42fd5b695db882fe6f48a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187a1a0f3baa9ace0f3aa7efa9cd794.png)
(3)如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ab3a7eb0f59993c7608576e47c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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较难
(0.4)
【推荐2】如图,在平面直角坐标系中,二次函数
的图象与x轴交于
,
两点,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/11/24/3116682679115776/3167518106198016/STEM/8f38c8130b34413d8deb23cf78c8a38a.png?resizew=152)
(1)求二次函数的解析式;
(2)点P是直线AC上方的抛物线上一动点,当
的面积最大时,求点P的坐标;
(3)Q是x轴上一动点,M是第二象限内抛物线上一点,若以A,C,M,Q为顶点的四边形是平行四边形,直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://img.xkw.com/dksih/QBM/2022/11/24/3116682679115776/3167518106198016/STEM/8f38c8130b34413d8deb23cf78c8a38a.png?resizew=152)
(1)求二次函数的解析式;
(2)点P是直线AC上方的抛物线上一动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
(3)Q是x轴上一动点,M是第二象限内抛物线上一点,若以A,C,M,Q为顶点的四边形是平行四边形,直接写出点Q的坐标.
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解答题-问答题
|
较难
(0.4)
【推荐3】如图,已知二次函数
(a,b,c为常数,
)与x轴交于点
和点
其中
,与y轴交于点
,若一次函数
(
,n为常数)也经过点C,且与反比例函数
(
,k为常数)交于点
,我们不妨约定:称函数
为一个“黄金组合”.
(a,b,c为常数,
),一次函数
(
,为常数)反比例函数
为一个“黄金组合”.若
,
,求一次函数
的解析式以及
和b的值;
(2)已知函数
为一个“黄金组合”,连接
.当
时,试问
能否为等边三角形?判断并证明你的结论;
(3)已知函数
为一个“黄金组合”,当四边形
是矩形,且
时,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149e9823fc0bc3e318643f779bda90d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6416c1a2013eb665f90b48dd57e76fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfcd2df26e9d66828b3f7a6c8939475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc24ba162aad01250a1f80e5b021018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe47e01d46d427917ef49b8b4547790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c479205740c2629093e7d6b7e7d78ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b8606616919cbfa8884fb11aa58b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae51885369165b421b582bdcf037d773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149e9823fc0bc3e318643f779bda90d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe47e01d46d427917ef49b8b4547790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9126c02163c5845e1edf7d44a34c3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764aae823efd7c7a3eb488c176972f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe47e01d46d427917ef49b8b4547790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae51885369165b421b582bdcf037d773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae51885369165b421b582bdcf037d773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be839a935e4da1b47b7a08a53e5e2dc1.png)
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