1 . 若关于x,y的二元一次方程组
无解,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1d45920d03f46755ae82a9686095c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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2 . 如图,在平行四边形ABCD中,
,垂足为点E,如果
,
,
, 则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93daeabd7d9f8a3e458d39b2c2613964.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905f306dc08525842a96cfcab32c1ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93daeabd7d9f8a3e458d39b2c2613964.png)
![](https://img.xkw.com/dksih/QBM/2020/3/9/2415766425976832/2418684933578752/STEM/f64045bca46143c0bc82020c09e93241.png?resizew=199)
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3 . 如图1,
是等边三角形,D.E分别是BC.AC上两点,且
,
与AD交于点H,链接CH.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7f3501ca-4b43-47cf-a058-1727fe890a6a.png?resizew=299)
(1)当
时,求
的值;
(2)如图2,当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe9e23bc343e7da3426886518e2fa60.png)
__________ ;
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387cb1a9bbf3452f9ead3697ce02eb0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7f3501ca-4b43-47cf-a058-1727fe890a6a.png?resizew=299)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a791da2c892787346863399f2254c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a557516283571952c3c3fce82e23d7e.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0887929a267fbcc1dc2bee21f455a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe9e23bc343e7da3426886518e2fa60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e323760ce16b1e5ade19659f015d89a.png)
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4 . 解不等式组
.第一步:解不等式①,得____________ ;第二步:解不等式②,得__________ ;
第三步:在数轴上分别把不等式①②的解的范围表示出来,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/70369985-b687-40ca-acc3-02d723ae26d0.png?resizew=188)
第四步:从两个范围中找出公共部分,得不等式组的解为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b645c96de37735902e1c25a5b92a6a4a.png)
第三步:在数轴上分别把不等式①②的解的范围表示出来,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/70369985-b687-40ca-acc3-02d723ae26d0.png?resizew=188)
第四步:从两个范围中找出公共部分,得不等式组的解为
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5 . 因式分解:
_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40cd440a1bf861b2633435f162cf558.png)
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解题方法
6 . 某地移动分公司为打破“流量月清零”的做法,推出流量“季度包”“半年包”“一年以上”三种业务.甲乙丙分别随机选择其中一种流量业务,则至少有一人选择“半年包”业务的概率是__________ .
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解题方法
7 . 在平面直角坐标系中,直线
与反比例函数
图象有两个公共点,则实数
的取值范围是________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c36b0b55edf49566522aef4dcd20fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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