利用十字相乘法分解因式:
(1)
;
(2)
.
(3)求方程
的解集.
(4)求证:对任意的x,a,b,都有
.
(5)已知“任意l和s,都有
”是真命题,借助这个结论将
进行因式分解.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdf57778bfe4dab4ee539f27ec9758c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96791c33798bd64168fbcfed8227e3d7.png)
(3)求方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86eb4ca4061cc0763ceb703feebc2b69.png)
(4)求证:对任意的x,a,b,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22f618009ca40d3c793a14fdbf1b32d.png)
(5)已知“任意l和s,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84b242ba1b490d6179e5f68f425bcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ac4ca64fdb94ebfac63b6d45a453be.png)
22-23高一·全国·随堂练习 查看更多[2]
更新时间:2023-09-17 13:47:05
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解题方法
【推荐1】已知集合
,集合
,集合
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(1)求
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(2)设全集
,求
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(3)若
,证明:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff48074ce2d4b8ec6b90c9348da6d34f.png)
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(1)求
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(2)设全集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713073cc7062a6d85586322f384d3be7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59de2d758d7a11fc3bd9479bdcb2012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0d51af53f5daf9b7d9724fa9a67a3b.png)
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解答题-证明题
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【推荐2】设
,若
,
,求证:
(1)方程
有实数根;
(2)
;
(3)设
,
是方程
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96defd6ccea9977b250daad116ef28cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4766fa588edd1021b3d38b8b16429a.png)
(1)方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0852599fd15f0648eb8137b098c8da.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c3439794cacd5743568f58fbbc30fd6.png)
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【推荐1】若
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【推荐2】某公司计划从甲、乙两种产品中选择一种生产并销售,每年产销
件.已知产销两种产品的有关信息如表:
其中
为常数,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ddf7a77f9961af4c20f2468091754b.png)
(1)若产销甲、乙两种产品的年利润分别为
万元、
万元,直接写出
与
的函数关系式;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
产品 | 每件售价(万元) | 每件成本(万元) | 每年其他费用(万元) | 每年最大产销量(件) |
甲 | 6 | ![]() | 20 | 200 |
乙 | 20 | 10 | ![]() | 80 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ddf7a77f9961af4c20f2468091754b.png)
(1)若产销甲、乙两种产品的年利润分别为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139a05b00108aac6e23e43c95010e438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)分别求出产销两种产品的最大年利润;
(3)为获得最大年利润,该公司应该选择产销哪种产品?请说明理由.
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