1 . 如图,过圆
外一点
,作圆的切线
、
,
、
为切点,
为弦
上一点,过
作直线分别交
、
于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/770036f5-da90-4916-9b60-0a17c5bea490.png?resizew=216)
(1)若
,
,
,求线段
的长;
(2)若
,求证:
.
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/770036f5-da90-4916-9b60-0a17c5bea490.png?resizew=216)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61348e4bd81707e2e3f6f18303276c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca498172c00e7f09670571d14127d3e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b873f6e5d876b52486f91805323553e.png)
您最近一年使用:0次
2016-12-04更新
|
127次组卷
|
2卷引用:2016届安徽省安庆市高三第三次模拟考试数学(理)试卷
2 . 如图所示,以直角三角形
的斜边
为直径作外接圆
,
为圆
上任一点,连接
,过点
作
边上的高
,过点
作圆
的切线与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572927076605952/1572927083085824/STEM/8b4739e826694db68b867b3d21f14257.png)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e17966797ec9e37f56c1193af65ebf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572927076605952/1572927083085824/STEM/8b4739e826694db68b867b3d21f14257.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572927076605952/1572927083085824/STEM/d68e153506ee44c4b95591843d14d7c3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4e1ec75d4b7bca856b2333167a5203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
3 . 已知四边形
为圆
的内接四边形,且
,
切圆
于点
且交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572926695251968/1572926701780992/STEM/d8b368a88d8c470abce08073c93a749c.png?resizew=203)
(1)求证:
;
(2)若
,
,
,试求圆
的半径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325d00656ae1b8d8923ec53b426d22b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236abcd5701f3d6d512f022a0f5abc9a.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572926695251968/1572926701780992/STEM/d8b368a88d8c470abce08073c93a749c.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e839007f29f4c72dfd700292ceb8802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348513d257538d4dd1b400987b623256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7809143e0e8692d6d4058891bf02559f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
4 . 如图,过圆
外一点
作圆
的两条切线
,其中
为切点,
为圆
的一条直径,连
并延长交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/7/5/1572891919761408/1572891926036480/STEM/f3c49d0f62bf494e8ccb63701f91a7ac.png)
(1)证明:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57445efa8ad1501d049e551f34a158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2016/7/5/1572891919761408/1572891926036480/STEM/f3c49d0f62bf494e8ccb63701f91a7ac.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad730736a2951a83c1a2aaf5d860f3a1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87467f850850e4ad3539551f01c3bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a5e0de7c48992ebefab48fcf47ca57.png)
您最近一年使用:0次
5 . 选修4-1:几何证明选讲
如图,四边形
内接于
,
是
的直径
于点
平分
.
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/92cdea254e864db6906d99032cf142e5.png)
(1)证明:
是
的切线;
(2)如果
,求
.
如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/531124a82cce4452863bdfbc97d7ec50.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/5a04432f7b6f4538b7a36f886e270c42.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/f34aa2e1ef514923a6678939779530ac.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/92cdea254e864db6906d99032cf142e5.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)如果
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/7da10b5f92c3425ba093b1d64e7027a6.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572861486104576/1572861492002816/STEM/1672db5cccd44e8caaf9a3f3d0e436fb.png)
您最近一年使用:0次
6 . 选修4-1:几何证明选讲
如图,
是圆
上的两点,
为圆
外一点,连结
分别交圆
于点
,且
,连结
并延长至
,使
.
![](https://img.xkw.com/dksih/QBM/2016/6/29/1572841445933056/1572841452412928/STEM/aeb4b20a9243428f988d03e38ac4d2c1.png)
(1)求证:
;
(2)若
,且
,求
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86fc603ff08ede3dab6d3dd7c3b0de0.png)
![](https://img.xkw.com/dksih/QBM/2016/6/29/1572841445933056/1572841452412928/STEM/aeb4b20a9243428f988d03e38ac4d2c1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bfc6b5683ec1919f8257765ce056b7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1332d3c7059a3ec0ef5cfb47716552fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331488685a5619e7191a7d61908ee0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
2016-12-04更新
|
109次组卷
|
2卷引用:2016届安徽省淮北一中高三最后一卷理科数学试卷
7 . 选修4-1:几何证明选讲
如图,
是
的直径,
为
上的点,
是
的角平分线,过点
作
交
的延长线于
点,
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/d1200e56d82a427daa231d154de6ba33.png)
(1)求证:
是
的切线;
(2)求证:
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/24503ad5af894ea98fe7c08b68ec259c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/18e0105db5ca4d17a05a34b7f91f7d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28dbfda60c4803ef7c89bab606cf0963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/48a0797c95cb429ead450fa130cf3bfa.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/c1365ff778054f9d8f348bc1d5c36d74.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/949c03610c524f63958b7e362d38ebab.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/d1200e56d82a427daa231d154de6ba33.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/9bf1dd175d5f485fa574b8637f1e9138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572837033607168/1572837039783936/STEM/293ce1a4d8d64ee7969b7186466e7a2a.png)
您最近一年使用:0次
8 . 选修4-1:几何证明选讲
如图,过圆
外一点
作圆的切线
,切点为
,割线
、割线
分别交圆
于
与
、
与
.已知
的垂直平分线
与圆
相切.
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572835794403328/1572835800875008/STEM/37092f849948492e9ff09819df40c478.png)
(1)求证:
;
(2)若
,求
的长.
如图,过圆
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2016/6/27/1572835794403328/1572835800875008/STEM/37092f849948492e9ff09819df40c478.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b52b062357fc451e0eadfe070289cf8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ddd1ddea23d50529dedb0e619642413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
您最近一年使用:0次
9 . 如图,
内切于
,切点分别为点
,连接
交
于点
,直线
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/19f7266aea784e64af50acf9027db540.png)
(1)求证:圆心
在直线
上;
(2)求证:点
是线段
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/f11b04bc76db41fe8b0169daabc9c1fc.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/39db4d6759e1485bbe79a1081fd2c802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/19f7266aea784e64af50acf9027db540.png)
(1)求证:圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
(2)求证:点
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/053feac368bb48e89b87796b39583020.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572764438323200/1572764444844032/STEM/db9e452c2a2c4b2590cfbf417e90929b.png)
您最近一年使用:0次
10 . 选修4-1、几何证明选讲
如图,已知
是圆
的直径,
与圆
相切与
为圆
上的一点,连接
,
.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572669819297792/1572669825466368/STEM/9618074a928841748bccad4bce881505.png)
(1)证明:
;
(2)证明:
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f28e27c2a9cc64a4d21242e8dbff57.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572669819297792/1572669825466368/STEM/9618074a928841748bccad4bce881505.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749172766389d88226362c58ed8770cd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e54259cf02248ee09f3ede84a17fda.png)
您最近一年使用:0次