已知直线l1:(a+1)x+y-
=0,l2:x-y-
=0.
(1) 当a为何值时,l1∥l2? 当a为何值时,l1⊥l2?
(2) 若l1与l2相交,且交点在第一象限,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee38f7d5ba5364afd63ba4f03c310d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67eff1dfd0c2bea60c72ec6a4ed77045.png)
(1) 当a为何值时,l1∥l2? 当a为何值时,l1⊥l2?
(2) 若l1与l2相交,且交点在第一象限,求a的取值范围.
更新时间:2017-07-15 19:44:34
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(2)若
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【推荐2】把一个均匀的正方体骰子抛掷两次,观察出现的点数,记第一次出现的点数为
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(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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(2)求直线
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【推荐1】已知两直线
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(1)若
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【推荐2】已知
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表一:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7383c643d74bb787f8f101830c12fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeaae6c694cd4bf7d0828353d451849.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f281814a940820e52ec332185871e22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52225f75cebeb64408d27837cec03b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383fcc122f267043fbafe0972bfb900.png)
(2)给定圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f333953d348a283b7e7824f16661645c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f00fdb0b1dfb21a2e192990b79be37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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(3)由(2)知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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表一:
线段![]() ![]() | ![]() |
![]() ![]() | |
![]() ![]() | |
线段![]() ![]() |
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