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解题方法
1 . 根据毕达哥拉斯定理,以直角三角形的三条边为边长作正方形,从斜边上作出的正方形的面积正好等于在两直角边作出的正方形面积之和.现在对直角三角形
按上述操作作图后,得如下图所示的图形,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b62a6a6167b2832999c152ed5b96ef.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629303e859eb016c778dc23ed47fccdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b62a6a6167b2832999c152ed5b96ef.png)
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2 . 设
为平面内的任意两个向量,定义一种向量运算“
”:
对于同一平面内的向量
,给出下列结论:
①
;②
;
③
;④若
是单位向量,则
.
以上所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29264166dd8f7d01fc7450f8fe56a291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b412d3054ea69685032f777669e41e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be40b04c18a099e2a838cdb9090b4cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4eaefbb9be6e5e836644cfbe0301573.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84086ac125c9f1a0504ac37ab0e6dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603ec2875cdda99123a21c7340fad3eb.png)
以上所有正确结论的序号是
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3 . 已知
是边长为1的正三角形,
是
上一点且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f865cb2e4a1c575b331e252a21d7d7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07377d977ef6a8f518b3004564544e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5d6c8be7019d123c0b1d4ab9e52814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d476da94dcade5f83541f3fca22a1039.png)
A.![]() | B.![]() | C.![]() | D.1 |
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4 . 已知
,
,且函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189575d7193fe6363865c2a664a89e9c.png)
(1)求
的最小正周期及单调递增区间;
(2)若
为锐角且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8edcf4850813f4c69fe6e9426207dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdb3d88238ec6a94a7d1dedaa9b80d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189575d7193fe6363865c2a664a89e9c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4443d42de2db7505b7a901e51ac74d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
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5 . 写出一个同时满足下列三个条件的函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81b823d0f2cf80f1aee1ff5a6f6a120.png)
______ .
①
,
;②
,
恒成立.③函数
为偶函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81b823d0f2cf80f1aee1ff5a6f6a120.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e298fe246eef819dd9b1edabe3bb9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e06bd072d0e7b6896d36b1c59ba797b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解题方法
6 . 在直角梯形
中,
,
,
,点
为梯形
四条边上的一个动点,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59880e470359d8e9faf6ae5ce155cf2a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 已知函数
(
)的图象向右平移
个单位后,图象关于点
对称,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a24b3578e16214a3afb4fd98ebc65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9531427f246890e815b7ed47e78daa78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58780ac91a3b8dbe41b8fa0e41e2beff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
8 . 已知棱长为1的正方体
分别是AB和BC的中点,则MN到平面
的距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe2d7f4c9ae3d6c991540bca0af97c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a52848aff08399a36f217356007a4b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 在
中,
.
为
所在平面内的动点,且
,若
,则给出下面四个结论:
①
的最小值为
;
②
的最小值为
;
③
的最大值为
;
④
的最大值为8.
则正确命题的序号是_________ .(写出所有正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c527566ec9aff483bf308e4119d2322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6adb8e055723620e10435c1632815c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bd4cdb5035ce43bfebeeeb9457f411.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6ddf31b7d9225a4239883af72d153b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59880e470359d8e9faf6ae5ce155cf2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d911e720abfb1b8892747d79ddc8f4d.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59880e470359d8e9faf6ae5ce155cf2a.png)
则正确命题的序号是
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解题方法
10 . 声音是由于物体的振动产生的能引起听觉的波,我们听到的声音多为复合音.若一个复合音的数学模型是函数
,则给出下面四个结论:
①
的一个周期为
②
的最大值为
;
③
的图象关于直线
对称;
④
在区间
上有3个零点;
其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48fe91f814d82ebb275cd58ae60479.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37729e58c080f2e36754c15cffffcdd2.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928c122b74428f126704c1f34724b46c.png)
其中,正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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