名校
解题方法
1 . 设平面
平面
,直线
,点
,则在
内过点
的所有直线中( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60be170a52db82cf37b30db0cde26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d2a947e3fdc214d40a7d3f54679a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16acea101c98a280a70c2fa0b2c04dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.不存在与![]() | B.只有两条与![]() |
C.存在无数条与![]() | D.存在唯一一条与![]() |
您最近一年使用:0次
2017-05-05更新
|
502次组卷
|
4卷引用:北京市西城区第十三中学2021-2022学年高一数学6月线上测试试题
解题方法
2 . 如图,已知直三棱柱
中,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2017/3/29/1654022447546368/1664858116472832/STEM/eef12743846d406f9fccf2ae1c2067e7.png?resizew=216)
(1)求证:
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2017/3/29/1654022447546368/1664858116472832/STEM/eef12743846d406f9fccf2ae1c2067e7.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ebe6a446b91e73b181f9f4d56264dd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
您最近一年使用:0次
名校
解题方法
3 . 在四棱锥
中,底面
为菱形,侧面
为等边三角形,且侧面
底面
,
,
分别为
,
的中点.
(1)求证:
.
(2)求证:平面
平面
.
(3)侧棱
上是否存在点
,使得
平面
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c603778990c5726c4bdef5038b759f7c.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8eada32f6d159b8b57f03af40ddca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(3)侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f475878dd1b32b0486cbf7b5ffbedd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a48b437f403a1879357cece32efada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505abdb4631fe10cdcdde3dc3d6aad32.png)
![](https://img.xkw.com/dksih/QBM/2017/11/11/1814911767027712/1815859262668800/STEM/cfebecfc78dc41269a8c9198a0ff330e.png?resizew=185)
您最近一年使用:0次
2016-12-04更新
|
1546次组卷
|
2卷引用:北京市十一学校2016-2017学年高二上学期期中考试数学(文)试题
解题方法
4 . 如图1,在直角梯形ADCE中,AD//EC,EC=2BC,∠ADC=90°,AB⊥EC,点F为线段BC上的一点.将△ABE沿AB折到△ABE1的位置,使E1F⊥BC,如图2.
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572546264317952/1572546270298112/STEM/5236eb81-1cb6-4671-8b96-780af043528e.png?resizew=437)
(Ⅰ)求证:AB//平面CDE1;
(Ⅱ)求证:E1F⊥AC;
(Ⅲ)在E1D上是否存在一点M,使E1C⊥平面ABM.说明理由.
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572546264317952/1572546270298112/STEM/5236eb81-1cb6-4671-8b96-780af043528e.png?resizew=437)
(Ⅰ)求证:AB//平面CDE1;
(Ⅱ)求证:E1F⊥AC;
(Ⅲ)在E1D上是否存在一点M,使E1C⊥平面ABM.说明理由.
您最近一年使用:0次
名校
解题方法
5 . 如图,在四棱锥
中,底面
是平行四边形,
,侧面
底面
,
,
,
分别为
的中点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572520102764544/1572520108605440/STEM/2e59c5fdcd8a489e93a1cd4bf0acf779.png)
(Ⅰ)求证:
平面
;
(Ⅱ)若
为
的中点,求证:
平面
;
(Ⅲ)当
时,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126b8c61090ac417e1f9b9038a33a9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda343129962dbadde66672a66bc4ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58b15380af11fba895191280da32c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4e36230f6e0e4be7181a9caa89b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46c696ff5f123a482bae81cf9a1b570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572520102764544/1572520108605440/STEM/2e59c5fdcd8a489e93a1cd4bf0acf779.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99063370e8d256bdb55d37bd8c69513e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6dfed58659a9cab4d1836c3d2effdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(Ⅲ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1585a3810c7c5e4b17fc89bc23fd60e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bab27c289c394563f5cff4dc11714eb.png)
您最近一年使用:0次
2016-12-04更新
|
2597次组卷
|
3卷引用:2016届北京市西城区高三上学期期末考试文科数学试卷
解题方法
6 . 如图,四边形
是菱形,
平面
,
,
,
,点
为
的中点.
(
)求证:
平面
.
(
)求证:平面
平面
.
(
)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a5b84309187976c7832c4cc57daef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caef5bb0d7867588c541010bdae97de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212b200cb65843fe03aab377d53991d7.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572519296892928/1572519303069696/STEM/e34ca01d38e747fc9731726e67877f23.png?resizew=181)
您最近一年使用:0次
2016-12-04更新
|
431次组卷
|
2卷引用:2016届北京市海淀区高三上学期期末考试文科数学试卷
名校
解题方法
7 . 如图,在四棱锥
中,底面
是正方形.点
是棱
的中点,平面
与棱
交于点
.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572517709578240/1572517715451904/STEM/1e90fcac06ab48bd8042e6a79549940c.png)
(1)求证:
;
(2)若
,且平面
平面
,试证明
平面
;
(3)在(2)的条件下,线段
上是否存在点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
平面
?(直接给出结论,不需要说明理由)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572517709578240/1572517715451904/STEM/1e90fcac06ab48bd8042e6a79549940c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6967901d6c855864df01e7bf7a15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3321ddb3483d7576d719d5b929f9bd87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cac0572ffc70fbe6676edea45559904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)在(2)的条件下,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2016-12-04更新
|
736次组卷
|
3卷引用:2016届北京市朝阳区高三上学期期末联考文科数学试卷
13-14高一上·河南·期末
名校
8 . 下列四个正方体图形中,
、
为正方体的两个顶点,
、
、
分别为其所在棱的中点,能得出
平面
的图形序号是_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2868b617c871e18c928c9a573bc8c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49de2536004d4f0819e781fffca41a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54cb2decd0d50d4031f7e7b7cb34fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a20a987842b48c3daa16c808b231cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e9c70a7bb76abc885c73c7ef7d8c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8065d2c6fd9075aa0607800a6319de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b31da247a9a1db8208b62af2876a0f3.png)
![](https://img.xkw.com/dksih/QBM/2016/2/16/1572482106957824/1572482113011712/STEM/f4360999ae00433b935cbfed1cc249af.png?resizew=332)
您最近一年使用:0次
2016-12-04更新
|
663次组卷
|
11卷引用:北京市昌平临川育人学校2017-2018学年高一下学期期末数学试题
北京市昌平临川育人学校2017-2018学年高一下学期期末数学试题(已下线)2012-2013年河南省涡阳四中高一上学期期末考试数学试卷(已下线)2014-2015学年山西省康杰中学高二上学期期中考试文科数学试卷2015-2016学年广东省佛山一中高二10月月考数学试卷2015-2016学年湖南省常德市一中高一12月月考数学试卷河南省郑州外国语学校2017-2018学年高一上学期期中考试数学试卷人教A版高中数学必修二 2.2.1直线与平面平行的判定 平面与平面平行的判定人教A版高一年级必修二2.2.1直线与平面平行的判定数学试题(已下线)2019年1月4日 《每日一题》人教必修1+必修2(上学期期末复习)直线、平面平行的判定及其性质【全国百强校】吉林省梅河口市第五中学2018-2019学年高一3月月考数学(文)试题吉林省通化市梅河口市第五中学2018-2019学年高一下学期3月月考数学(理)试题
9 .
是矩形,
,
,沿
将
折起到
,使平面
平面
,
是
的中点,
是
上的一点,给出下列结论:
① 存在点
,使得
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e95fa1c3bcd3d0464fcadf248e90ace.png)
② 存在点
,使得
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
③ 存在点
,使得
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
④ 存在点
,使得
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb7f8a1055fa0bf762539aeb070d3d7.png)
其中正确结论的序号是____________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f8441e5e499d705e4625e4c7db33dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ebf8aa867ccca195ec94c3c96e9b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
① 存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e95fa1c3bcd3d0464fcadf248e90ace.png)
② 存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
③ 存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d508d64a98fa7be09fe06e3faa0a483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
④ 存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb7f8a1055fa0bf762539aeb070d3d7.png)
其中正确结论的序号是
您最近一年使用:0次
2016-12-03更新
|
797次组卷
|
2卷引用:2015届北京市延庆县高三3月模拟理科数学试卷
10 . 如图,在底面为平行四边形的四棱锥
中,
,
平面
,且
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571946720264192/1571946726064128/STEM/fecc13c3-1a9f-4d9c-a8ef-aaa2d8d1a7a8.png?resizew=153)
(Ⅰ)求证:
;
(Ⅱ)求证:
平面
;
(Ⅲ)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571946720264192/1571946726064128/STEM/fecc13c3-1a9f-4d9c-a8ef-aaa2d8d1a7a8.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次