(1)分解因式:
(2)计算:
(结果只保留正整数指数幂)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fa76b5e860c20363c5e8c175b1f31a.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519677f9f7a88bfc914b3e6d1c99a845.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75dab06d987e1da44d4882c2504d3b8d.png)
更新时间:2018-02-01 10:05:02
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相似题推荐
解答题-问答题
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(0.85)
名校
【推荐1】回答下列问题:
(1)方法学习:把二次三项式
因式分解,可按照如下方法:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b47e38a004e31f2edd4540c779a000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf19fc3381726a255d84deed051e9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48db66e66d448f6b05ba83540c6f647a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d138b75f5bb75f171ffc2d80899bdddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08006fe0c945c35422f7577a9946399c.png)
应用上述方法,把二次三项式
的因式分解.
(2)拓展应用:由上述因式分解过程可知,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe2113e49411c0e8eef6e8d47b1ec2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e5fbd8462ccf42d619c2f55501d11ec.png)
当
时
即
时
取最小值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
参照上述分析过程回答:对二次三项式
,当
的值为 时,此二次三项式取最小值,这个最小值是 .
(1)方法学习:把二次三项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b47e38a004e31f2edd4540c779a000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b47e38a004e31f2edd4540c779a000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf19fc3381726a255d84deed051e9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48db66e66d448f6b05ba83540c6f647a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d138b75f5bb75f171ffc2d80899bdddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08006fe0c945c35422f7577a9946399c.png)
应用上述方法,把二次三项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259ba536ffa03fe4c10e2fff55eee794.png)
(2)拓展应用:由上述因式分解过程可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe2113e49411c0e8eef6e8d47b1ec2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e5fbd8462ccf42d619c2f55501d11ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a73e14dffa2635db5830860d24b9a43.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba53065eb180a682305fddb95d14b62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b47e38a004e31f2edd4540c779a000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
参照上述分析过程回答:对二次三项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf913f52218a266035cd205e3e05aaf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-问答题
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较易
(0.85)
【推荐2】阅读材料:若
,求
、
的值.
解:∵
,
∴
,
∴
,
∴
,
,
∴
,
.
根据你的观察,探究下面的问题.
(1)已知
,求
、
的值.
(2)已知
,
,
是
的三边长,满足
,且
是等腰三角形,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b371f5ba80720daf31276a4df80ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b371f5ba80720daf31276a4df80ff3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28255c51efbd317a56b4a459471d2a18.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55031652d1bd4dd263ab691eded2dccb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e59e8e73bff0cb4196b4e016d480d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d6a62fdd8e304b00f03ea89594fea9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
根据你的观察,探究下面的问题.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59edd1764e895b96a3a1a731ca02049e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872ca7dbeaf5787d7d82f307f5425922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次