解题方法
1 . 如图,在矩形
中,点
是
的中点,点
在
上.
是
上靠近
的三等分点,设
,求
的值;
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513430f95baf6d2136dbaee93d25d9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cac82fe9a990a3923a43c453486c388.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1a7aebc26cd4c18a34db7fe0fdb95a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c324a9ef05893efa68862d578cfa96.png)
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2 . 已知函数
的最小正周期为
,且它的图象关于直线
对称,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967910584cddfdd66bf21749bc511d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4eae5056ae4e4f11c49fe4b1fb67908.png)
A.将![]() ![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
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3 . 在空间直角坐标系中,已知
,则四面体ABCD外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3ec05187fced55230215fb95b46c4d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 定义:任取数列
中相邻的两项,若这两项之差的绝对值为1,则称数列
具有“性质1”.已知项数为
的数列
的所有项的和为
,且数列
具有“性质1”.
(1)若
,且
,写出所有可能的
的值;
(2)若
,证明:“
”是“
”的充要条件;
(3)若
,证明:
或
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4ac9c2787e5c2b6ce99f89b50b0dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a72be91e4148dbd19e935bd9e51a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e1a57b212411267bff20b97d6c3e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f2867385db84ec7fac034865ea91b6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f4aea81669864630ee9be6f69e43fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e12058f26dd0b9319a97bdf8e3b4702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a19410555c6ed7f5d55becd4516609.png)
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名校
5 . 过圆
外一点
做圆
的切线
,切点为
,若
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e0db273061d0331e4e5da9ff1e955e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b0dd09a59056af579586ab8b69f4f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9817a48b819ab971e79bad7b20250294.png)
A.![]() | B.![]() | C.![]() | D.8 |
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6 . 学校安排甲、乙等5名学生作为社区组织的“中老年趣味体育大赛”的项目志愿者,已知该比赛有
这3个项目,每名学生只去1个项目做志愿者,且每个项目的志愿者至少有1人,则不同的安排方法有__________ 种.(用数字作答)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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7 . 已知函数
的定义域为
,若
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454b56ac2843867ea813105b372fa9bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51eb2613dda00677d447c986cac505bc.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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名校
解题方法
8 . 已知
且
,若函数
,的最大值不超过1,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab873855ed8ca580c0ac1f461ccc3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 已知函数
图象的一条对称轴为直线
,这条对称轴与相邻对称中心之间的距离为
,则下列选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce7cc2c4fcf9afcfb8941f489c2502e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e56709c76b5ae87d528fb5240e7617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e24f048f9a87274863ba2c037d7a5c.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() |
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10 . 在
中,角A,B,C所对的边分别是a,b,c,下列叙述正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
您最近一年使用:0次