21-22高二·江苏·课后作业
1 . 若直线l与直线
交于点P,与直线
交于点Q,且线段PQ的中点是
,则l的斜率为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ae4b8715ebb03970ccabe1abf439c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0924ff22fff9f5639feb0ceeece80d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-03-01更新
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