解题方法
1 . 若
,且
为钝角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeac303e508a01609f2dbecda7793875.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2148d0efc08af355dc53e86d18e2af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeac303e508a01609f2dbecda7793875.png)
您最近一年使用:0次
2018-02-14更新
|
626次组卷
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5卷引用:河北省邢台市2018届高三上学期期末考试数学(文)试题
2 . 若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18ac2817c37f1e8ceaf0b2ad0719945.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5960eef4ba8aa8fbb8baf61a7a1f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51fb1f025d6321a631f47bafe05f0257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18ac2817c37f1e8ceaf0b2ad0719945.png)
您最近一年使用:0次