历史上的数学巨人欧拉最先把关于x的多项式用
来表示,例如:
,当
时,多项式的值用
来表示,例如:当
时,多项式
的值记为
.
(1)已知
,求
的值;
(2)已知
,当
,求a的值;
(3)已知
(其中a,b为常数),若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58cbded0c91457fdf2ef7fd1e7db1ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b53b86bd516400d6fa7dabb3603f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f484115a9df1b6060d6b14df85c6f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acefdacd5c80d7bd7a515422b3ee6ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b601caf4c8c051814ebbbf75e4ad92.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14899717b0ba6d94f7d7f3435a88da21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3ca3f7b851b72e661b52a2ad7144d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1ba716ab3aa24c0a5e778c30ead519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8dfda35f1dc37e92b20d67219aa91e.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e30cef40be4819585147249402a6189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e2995ae096f7b479a3755fd9f0aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63adc9b37ec6dc7a225077bcbd153939.png)
19-20七年级·江西南昌·期中 查看更多[2]
更新时间:2020-12-11 19:21:54
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解答题-问答题
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【推荐1】已知A=2x2-3ax+2x-1,B=-x2+2ax-3,且C=3A-2B.
(1)求多项式C;
(2)若C中不含x项,求12﹣26a的值.
(1)求多项式C;
(2)若C中不含x项,求12﹣26a的值.
您最近一年使用:0次
解答题-计算题
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【推荐2】阅读材料:“如果代数式
的值为
,那么代数式
的值是多少?”我们可以这样来解:
原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99668bee82d1ec63f09ccd6c116a170c.png)
当
时,原式
.
仿照上面的解题方法,完成下面的问题:
(1)已知
,求
的值;
(2)已知
,求
的值;
(3)已知
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f705ca44cea883fc9fdef1db4e2b2bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbddccb3c15eb2636396628585aaee05.png)
原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99668bee82d1ec63f09ccd6c116a170c.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47dd2fdddd755f8be5cdc2ddcb0e2915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2388f99c164c984cb4059bd62b0350b5.png)
仿照上面的解题方法,完成下面的问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271cabad72ebfaf611646c788003300e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7eea12699993141c6b6e9d1912774e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5178895b1b7670ea686100801de433f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0b295da5567eb5fa483e1157841729.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed95808688a43a1e9ef1d67559fe63bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef810ea389baf814b81e686277d06227.png)
您最近一年使用:0次