解题方法
1 . 在梯形
中,
,设
,若用
的线性组合表示
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6eab0544c9fad5acde25bec349fb02.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42468c4d607dee3106b0d2ea9f1edc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a6dd07e480128b95f265fae112f4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6eab0544c9fad5acde25bec349fb02.png)
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名校
2 . 已知集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49cbdf82cbf7e564a73b26ecfc46403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
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3 . 某林场为了及时发现火情,设立了两个观测点A和B.某日两个观测点的林场人员都观测到C处出现火情.在A处观测到火情发生在北偏西
方向,而在B处观测到火情在北偏西
方向.已知B在A的正东方向
处,那么火场C与A距离约为___________
.(结果精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc9600d011c14315338e99623269d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36b7bffda85107582b021928dbd4d3c.png)
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解题方法
4 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c7e086c3ab30df4d79870ae9a3cce5.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3442de0573a140970cbaffc82e1122f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c7e086c3ab30df4d79870ae9a3cce5.png)
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5 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950655420ae7cae5fbd606e3604864ab.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba16587e556088a35c71f522f988671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950655420ae7cae5fbd606e3604864ab.png)
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解题方法
6 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b21c1ca840ac0f0c4715160fb29753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
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7 . 设
,若函数
的.定义域为
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3fa587a9b2e1c9fe82750db0ec22fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd210a5fe44d2d93c98ab6e7a153d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803066e3fe042831652d29d563516679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
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8 . 若复数
,
满足
.且
(i为虚数单位),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41813be61104fce7a33368d0a4429651.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db439eae71afd7b462a07c61d3861330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b004c02ad0d4d487eb7623f92d306660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41813be61104fce7a33368d0a4429651.png)
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9 . 若扇形的圆心角为
,半径为4,则其弧长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
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10 . 已知扇形的半径长为5cm,圆心角是2rad,则扇形的弧长是______ cm.
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