先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6bcc07f58f78c95a852fa252687be5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
更新时间:2024-05-11 12:24:03
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相似题推荐
解答题-计算题
|
适中
(0.65)
【推荐1】(1)解方程组:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf95c0f71dbd308d03af6e47aa7bf72b.png)
(2)解不等式组:
,把解集在数轴上表示出来.
(3)先化简,再求值:
,其中
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf95c0f71dbd308d03af6e47aa7bf72b.png)
(2)解不等式组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673c3d186af76109339f247754bfc264.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/da152e2b-b9b8-49bb-a5a2-68142f2a5d05.png?resizew=366)
(3)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca1c5086d9105d85cad14e58790978f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f3fa679bb55ded25a9b72a8e788cb1.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】计算
(1)
;
(2)
;
(3)
;
(4)(2a+b﹣4)(2a+b+4);
(5)
;
(6)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65885b241648eca3cf64d06bd4de7204.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b55bb6c54ee67a1e638579207af672.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b786d7d0781392f3f695d654c0493b49.png)
(4)(2a+b﹣4)(2a+b+4);
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62683e46381af6f7fc4133ef7d671e1a.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892a057c9388d6bb9d08fb0a2774dbfd.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】阅读材料:若
,求
、
的值.
解:∵
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf72e8aad5b0e809dc97ecb8d28a443.png)
∴
,
∴
且
,
∴
.
根据你的观察,探究下面的问题:
(1)
,则
______,
______;
(2)已知
,求
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.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/19ab3cd8d4125c4ad18333dff0cce5f5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf72e8aad5b0e809dc97ecb8d28a443.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8989fead62857fb90b5199bdcad51654.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e59e8e73bff0cb4196b4e016d480d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98912998556ef3f2907bee2a7531dc50.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d883d7c925d974922cd11e2d4f206a.png)
根据你的观察,探究下面的问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35832510e052ac68cd0f5020e4f998bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78129545759c5cb4d0257d029ee2b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3e8305c1383079b9c1bef737a451a2.png)
您最近一年使用:0次