先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493fcd213f3bfd43e07adab439f75949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d11196c1805e795aa4446decd8b9ac.png)
更新时间:2024-05-04 13:13:33
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相似题推荐
解答题-计算题
|
适中
(0.65)
【推荐1】化简求值:2(3x2+y)-(2x2-y) ,其中x=
,y=-4.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】已知关于
的多项式
是二次三项式,
(1)求
和
的值;
(2)设
,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487a6bdbb30ab842c9ef7911a6c08a27.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821d795a75df8d2de90b8f595c0d0982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba53065eb180a682305fddb95d14b62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fe0135d7267ad476bf64004410e018.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】观察下列等式:
①
;
②
;
③
;
.
回答下列问题:
(1)仿照上列等式,写出第
个等式:______;
(2)利用你观察到的规律,化简:
;
(3)计算:
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1832fab4779d224e8000f49c211139d3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2416746b01442db41e72f89b93309e.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f400f1cd6848ac44352ce5563894f3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
回答下列问题:
(1)仿照上列等式,写出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)利用你观察到的规律,化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eac91096ac3720008f529a45d1b624.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a03037e5600d7384009e8a63b2fcc29.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】阅读材料:
若
,求
,
的值.
解:因为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0721018d52a31cca446d09df4d8a89d.png)
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff387e9ae6c9965df41b2930deb6a52.png)
所以
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c4075116e036bd27e718c98d3600b2.png)
所以
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
根据你的观察,研究下列问题:
(1)已知
,求
的值;
(2)已知
的三边长
、
、
都是整数,且满足
,求
的周长.
若
![](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:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0721018d52a31cca446d09df4d8a89d.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff387e9ae6c9965df41b2930deb6a52.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748f0ecdb5d9c1c3909008c39585e0ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c4075116e036bd27e718c98d3600b2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
根据你的观察,研究下列问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d29d4752c6716c722b10c4660485b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](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/04bd57a622ed5e60cf626134072123f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次