1 . 在直角坐标系
中,
是过
且倾斜角为
的一条直线,又以坐标原点
为极点,
的非负半轴为极轴建立极坐标系,曲线
的极坐标方程为
.
(1)写出直线
的参数方程,并将曲线
的极坐标方程化为直角坐标方程;
(2)若直线
与曲线
在
轴的右侧有两个交点
,过点
作
的平行线,交
于
两点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c10f14aae6fb21e047ecb39cdf40c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd857fdf83c7bf71883cfdd0c79a13a.png)
(1)写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0d26766290953a9f5f7ad7791e40b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f461f01e01ed785cdd10a846b64dd5.png)
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2023-06-01更新
|
209次组卷
|
4卷引用:江西师范大学附属中学2023届高三三模考试数学(理)试题
名校
2 . 在平面直角坐标系
中,圆C的参数方程为
(
为参数),直线l的参数方程为
(t为参数),设原点O在圆C的内部,直线l与圆C交于M,N两点;以O为极点,x轴的正半轴为极轴建立极坐标系.
(1)求直线l和圆C的极坐标方程,并求a的取值范围;
(2)求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513ab96d9b0704728f0f15c1186a63d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9f6ea18207d6f880b28ae20fbdf832.png)
(1)求直线l和圆C的极坐标方程,并求a的取值范围;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4de13a47637548ce5594ed8d64dec0c.png)
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2022-02-21更新
|
525次组卷
|
3卷引用:江西省吉安市2022届高三上学期期末数学(文)试题
名校
3 . 已知椭圆
(
是参数),A和B是C上的动点,且满足
(O是坐标原点),以O为极点、以x轴的正半轴为极轴建立极坐标系,点D的极坐标为
.
(1)求线段AD的中点M的轨迹E的普通方程;
(2)利用椭圆C的极坐标方程证明
为定值,并求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba82b5c01f49c4229240f1e6aa3fc0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c119050a3587655cdbd264726ec478.png)
(1)求线段AD的中点M的轨迹E的普通方程;
(2)利用椭圆C的极坐标方程证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dcb4841ae7bb1d5f91837094cdfcf2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
您最近一年使用:0次
2021-05-30更新
|
859次组卷
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3卷引用:江西师范大学附属中学2021届高三三模考试数学(理)试题
4 . 平面直角坐标系
中,点
的坐标为
,在以坐标原点为极点,
轴的正半轴为极轴的极坐标系中,曲线
的极坐标方程为
.
(1)求曲线
的参数方程;
(2)若
是曲线
上的不同两点,且
,求证:线段
的中点
恒在一条直线上,并求出此直线的直角坐标方程.
![](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/b12f5329716234ea36d40f9058f8270a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad399204514317f798ca9659ee83fc0f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224c47281302dd146484bc1bdf1a3b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2020-06-08更新
|
250次组卷
|
2卷引用:江西省稳派教育2020届高三下学期调研考试(三)数学(理科)试题
5 . 在平面直角坐标系
中,直线
的参数方程为
(
为参数),以坐标原点
为极点,
轴正半轴为极轴建立极坐标系,曲线
的极坐标方程为
.
(Ⅰ)求直线
的普通方程和曲线
的直角坐标方程;
(Ⅱ)若点
的极坐标为
,直线
与曲线
相交于
,
两点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6199b3cca2e49aaabace363c0ed7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f34ad37ee24b2a380d2310c54316067.png)
(Ⅰ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a174d698f45032865f769adb821bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13fe4e032aae6845be171920a6c56ec.png)
您最近一年使用:0次
2020-07-29更新
|
209次组卷
|
3卷引用:江西省宜春中学、万载中学、樟树中学2021届高三上学期第一次联考数学理科试题
6 . 在平面直角坐标系
中,圆
的参数方程为
(
为参数),直线
的参数方程为
(
为参数),设原点
在圆
的内部,直线
与圆
交于
、
两点;以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系.
(1)求直线
和圆
的极坐标方程,并求
的取值范围;
(2)求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c4a027310e2afbc715fb5ec6cea33f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b8876c9b971d4a16429a9019ca9ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffd2e3363992060c0b8785f031d2877.png)
您最近一年使用:0次
2020-05-30更新
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954次组卷
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8卷引用:江西省贵溪市贵溪一中2021届高三上学期第三次月考数学理科试题
7 . 在平面直角坐标系
中,直线
的参数方程为
(
为参数且
).在以坐标原点为极点,
轴的正半轴为极轴的极坐标系中,曲线
的极坐标方程为
.
(1)求直线
的极坐标方程及曲线
的直角坐标方程;
(2)若点
在直线
上,点
在曲线
上,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9de280d224eb4972da6c7fa2de3fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823ab696d27d40920c39b8c910789380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897b95b4fa201f0e08bff76016cf2fd9.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a440a9d51215d37f046d1bb411b55aa.png)
您最近一年使用:0次
名校
8 . 在平面直角坐标系
中,以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系,曲线
的极坐标方程为
,若极坐标系内异于
的三点
,
,
都在曲线
上.
(1)求证:
;
(2)若过
,
两点直线的参数方程为
(
为参数),求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0cb878349009a779d94b1bc40319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e5094ea2e1ae387f33e0b554c60b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4aecf3b1ceaa9b4f660030672baddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a806e583790b07ed766d51249fa013ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a653c31f6db4cfd6b6b2d7bc5a0424b.png)
(2)若过
![](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/8ea6230afeaa1027dc69969cb5d74c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5241e0e07a9cd48e4f853405dca1a03.png)
您最近一年使用:0次
2019-04-08更新
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2892次组卷
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14卷引用:【校级联考】江西省吉安一中、九江一中、新余一中等八所重点中学2019届高三4月联考数学(理)试题
【校级联考】江西省吉安一中、九江一中、新余一中等八所重点中学2019届高三4月联考数学(理)试题【校级联考】江西省吉安一中、九江一中、新余一中等八所重点中学2019届高三4月联考数学(文)试题江西省临川二中、临川二中实验学校2019-2020学年高三上学期第三次月考数学(文)试题【全国百强校】福建省厦门第一中学2019届高三5月市二检模拟考试数学(理)试题广东省惠州市2019-2020学年高三第三次调研考试文科数学试题广东省惠州市2019-2020学年高三第三次调研考试理科数学试题(已下线)2020届高三12月第01期(考点13)(文科)-《新题速递·数学》2020届高三1月(考点13-14)(理科)-《新题速递·数学》.广西名校2021届高三大联考(三)数学(文)试题广西桂林、崇左市2021届高三二模数学(理)试题陕西省西安交通大学附属中学2021届高三下学期第四次模拟考试理科数学试题广西桂林、崇左市2021届二模数学(文)试题广西名校2023届高三下学期3月份联考数学(理)试题广西名校2023届高三下学期3月份联考数学(文)试题
名校
9 . 极坐标系与直角坐标系
有相同的长度单位,以原点
为极点,以x轴正半轴为极轴,已知曲线
的极坐标方程为
,曲线
的参数方程为
(
为参数,
),射线
与曲线
分别交于(不包括极点
)点
.
(1)求证:
;
(2)当
,B,C两点在曲线
上,求
与
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925b34a1e7a48f450d883f9a0197e5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ccfa7ce00d752f762f3692cc067e2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005c2f9ee561cf030fb696ff80884739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3afb8f7e58956c81d15f2f86d1f57b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703bf986844333a1524b971ad1696b77.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cddce60584c6209740248d3e2005fd52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2016-12-03更新
|
1210次组卷
|
13卷引用:江西省重点中学盟校2017届高三第二次联考数学(理)试题
江西省重点中学盟校2017届高三第二次联考数学(理)试题【全国百强校】江西省临川第一中学2019届高三10月月考数学(理)试题2016届宁夏银川一中高三上学期第一次月考理科数学试卷2016届宁夏银川一中高三上学期第一次月考文科数学试卷2016届湖南师范大学附中高三上学期月考三文科数学试卷2016届陕西师大附中高三下第十次模拟文科数学试卷2017届河北省衡水中学高三上学期六调数学(理)试卷【市级联考】湖北省黄冈市八模2019届高三理科数学模拟测试题【市级联考】湖北省黄冈市2019届高三八模模拟测试卷(二)文科数学试题2020届四川省绵阳南山中学高三3月网络考试数学(理)试题(已下线)专题11-1 参数方程与极坐标大题15种归类-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)【全国校级联考】河北省卓越联盟2017-2018学年高二下学期第三次月考数学(文)试题人教A版 全能练习 选修4-4 综合测评 模块结业测评(三)
10 . 选修4-4:极坐标系与参数方程
已知极坐标系与直角坐标系
有相同的长度单位,以原点
为极点,以
正半轴为极轴,已知曲线
的极坐标方程为
,曲线
的参数方程是
(
为参数,
,射线
与曲线
交于极点
外的三点![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/e479df6a627f4212bd620bd540529dc3.png)
(1)求证:
;
(2)当
时,
两点在曲线
上,求
与
的值.
已知极坐标系与直角坐标系
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/37382debf342480f9cdc7ff94b89681b.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/31cbb7d2f8234e58b060e7ecec37b643.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/e3e2e0d689df481ca82ddaedf907d581.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/3257af45dc5b45c899ec051219dcd134.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/7382e8e1ce53408cbde4d8587b52b558.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/17b95595009843a3827cfff03ebed5ad.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/bd870c9661a74af5b4a643e111511350.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/9721d0bdf16647d0acc16d5debc9ee43.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/033449f234484ff299f621781bfbb646.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/06b99d1866ee40d1bc03daa90ad0dd01.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/3257af45dc5b45c899ec051219dcd134.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/31cbb7d2f8234e58b060e7ecec37b643.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/e479df6a627f4212bd620bd540529dc3.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/6ec77e53dca84834b513660646cded9b.png)
(2)当
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/0f46001316d74e3c8a69ef0ff496b7b6.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/125e0de7b60d4695a0488108a4e31ec2.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/17b95595009843a3827cfff03ebed5ad.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/7a67c5c1690e4ef09024d6da028e1007.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572109337952256/1572109344276480/STEM/88e8f8fe78f7407f9ed861f0722ead96.png)
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