当
时,多项式(4x3﹣1997x﹣1994)2001的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b9c042729f29b0547bf160b24d31ec.png)
A.1 | B.﹣1 | C.22001 | D.﹣22001 |
19-20七年级下·宁夏中卫·阶段练习 查看更多[3]
宁夏中卫市宣和中学2019-2020学年七年级下学期第二次月考数学试题(已下线)第2章 整式加减 单元检测(2)-2020-2021学年七年级数学上册十分钟同步课堂专练(沪科版)(已下线)【竞赛】第一章 实数及代数式的运算和求值 §2 求解有关实数及代数式运算和求值问题的基本方法
更新时间:2020-04-03 08:49:53
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【知识点】 已知字母的值 ,求代数式的值解读
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【推荐1】有依次排列的两个整式
,
,用后一个整式B与前一个整式A作差后得到新的整式记为
,用整式
与前一个整式B作差后得到新的整式
,用整式
与前一个整式
作差后得到新的整式
,依次进行作差的操作得到新的整式.下列说法:①当
时,
;②整式
与整式
结果相同;③当
时,
;④
;其中,正确的说法有( )个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6358c71f84359dac9dab9bb795e13224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341ba6bd9c77b16c96f52393a56c05d1.png)
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【推荐2】对于多项式
记为
,即
;若令
,
,即
;下面几个结论正确的个数有( )个.
(1)存在实数x使
成立,则k的取值范围是
;
(2)若
,则
;
(3)若
,则
或
;
(4)存在整数
,使
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292f54cdb7f0f6742bd6570de1d32f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72df651e67c045ea5d886abef4c2165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7daafbc305f86b6eefc45303c67bd673.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107babba45f110012183dc4dc54490f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ab8333be773a244916727829366b33.png)
(1)存在实数x使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c4a2e79be0895301c94b21acd69456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0d1cf8b61b1fcf4ab15d4aa1c9e640.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19417f09e84b7a03145b3ad7755f473b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54889bd61cefd26b735607fd0657697a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ba1c45c55da8fb125b91b100479e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42b1011ae68626c689c6b681920b8e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(4)存在整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cedd5554fe54fbd284379df6a7e537.png)
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