已知x=
+
,y=
﹣
,求:
(1)
的值; (2))
+
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745c100afb56c39c7706fc59aacac0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916bb2cc1b29574ff95b47567c59ee0c.png)
更新时间:2021-08-12 22:12:08
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】利用完全平方公式,可以将多项式
变形为
的形式,我们把这样的变形方法叫做配方法.我们已学习了用配方法解一元二次方程,除此之外,利用配方法还能解决二次三项式的最值问题.阅读如下材料,完成下列问题:
材料:对于二次三项式求最值问题,有如下示例:
.因为
,所以
,所以,当
时,原式的最小值为2.
完成问题:
(1)求
的最小值;
(2)若实数
满足
.求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e600c20cd4be3321dc5ea832833d1aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3be80d17de736b34e416a174dd3822.png)
材料:对于二次三项式求最值问题,有如下示例:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac400dc52c65b63bf21a98285efdfb5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7baf1acc4c079bebfbf5c8240e5d8110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89dbada37c01df0e3ad5120d41800248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
完成问题:
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d967e7cfa34bb239bd33949e37223de.png)
(2)若实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47af7a931f01fee4b092c0bbeb466e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb17e1c2ca01e83954db95547769340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541be2ddc81667d69814f9d48f6cdea9.png)
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