1 . 如图,卡片A、B、C各代表一个代数式,从三张卡片中取两张进行因式分解运算.
(2)嘉嘉发现:“若选择A、B卡片,不论
为何整数,其结果总可以被
整除”,请确定满足条件的最小正整数
的值.
(2)嘉嘉发现:“若选择A、B卡片,不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303d752dc3ac209e91e1b6f21d78f5ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 已知下列等式:
①
,
②
,
③
,
④
,
……
(1)请仔细观察,写出第6个式子;
(2)根据以上式子的规律,写出第n个式子,并用所学知识说明第n个等式成立.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880158b725ac616f6aa450ae633929c1.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c5b874055ea47f73d4a2864889bc34.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51c773a240e553e3b67356d29875344.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8367bbe78d832ed20bca5c241ffdc41.png)
……
(1)请仔细观察,写出第6个式子;
(2)根据以上式子的规律,写出第n个式子,并用所学知识说明第n个等式成立.
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2024-05-15更新
|
78次组卷
|
3卷引用:第4章 因式分解(单元测试·综合卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
(已下线)第4章 因式分解(单元测试·综合卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)安徽省宿州市砀山县2023-2024学年七年级下学期期中数学试题安徽省六安市舒城县仁峰实验学校2023-2024学年七年级下学期期中数学试题
3 . 已知
,
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38cfacb377d5b320df5ecd63b6fa6a9.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61550fe154d04a13a9f06c63a3a5ab63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50be29633c81edbae881ef2ebe40a6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38cfacb377d5b320df5ecd63b6fa6a9.png)
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名校
4 . 若
是方程组
的解,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ddf5c595c0eff128a9c5026642fb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7c292aa42f595b96272dce035bbe57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
A.![]() | B.![]() | C.![]() | D.16 |
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5 . 已知
,
,求下列各式的值:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc12fed7a6f4777c0fccc896e624281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4bb3296249d8b1ca8416d3c4a0bf75.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745c100afb56c39c7706fc59aacac0ba.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1d0f21d91ba8c4d7a9ea415af0ee2f9.png)
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6 . 观察下列算式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bedce8765f40bd394f6d9585f83cac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e95c5d21c5985358cb8275ff393022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6cc6677a58be9c88d0da0e02cecf58.png)
…
(1)可以得到:
( )+( );
(2)可以发现:
( )+( );
(3)请你证明你的发现.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bedce8765f40bd394f6d9585f83cac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e95c5d21c5985358cb8275ff393022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6cc6677a58be9c88d0da0e02cecf58.png)
…
(1)可以得到:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9cee471a517ab1a22ece05d727ae42.png)
(2)可以发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00c049e7067c3ab6e4dd009ae50a460.png)
(3)请你证明你的发现.
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7 . 阅读理解题:
原理:对于任意两个实数
、
,若
,则
和
同号,即:
或
;若
,则
和
异号,即:
或
.
(1)分析:对不等式
来说,把
和
看成两个数
和
,所以按照上述原理可知:(Ⅰ)
或(Ⅱ)
,所以不等式
的求解就转化为求解不等式组(Ⅰ)和(Ⅱ),请你按照此种方法求出不等式
的解集;
(2)应用:解不等式
.
原理:对于任意两个实数
![](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/39d5f0d374837655cc286d326305da36.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/f17aa651392e64c5c95f14f59a0ec185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24483caba4aa37def32fe3c4e1ab1842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ed37ee7432002cd0e0978b2012e184.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/af5fb45fa98fa3f0d6efd85d100d1c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c4db4f8e5f00a53b246f71e1f1578d.png)
(1)分析:对不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8428a78b7ebfe6eb85b1fdb248948479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7396af7fa4423ee5980e48f0038bceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f013a3e5d9e2ed54ef0874d88057964.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/af458bc1828a9cb7965952295cee8886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ad35f7b02f1445caa88547721916d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8428a78b7ebfe6eb85b1fdb248948479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8428a78b7ebfe6eb85b1fdb248948479.png)
(2)应用:解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d439acf8554c45a9714530e1416e07de.png)
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8 . 把下列各式因式分解:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b98d50681878f0843b97c3a3de6c7c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a00c2452e5d46a3bbbc2643575648a.png)
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9 . 因式分解:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32dea7259cd05d2b9a3dd2d54276c0d7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3100febb5d600b4ceddf7d6d8c428cf3.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3e7983b641fe3c32ccd247c5052f28.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624f72c6676be8711eff04e3a4a375d7.png)
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2024-05-13更新
|
661次组卷
|
2卷引用:河南省郑州市郑中国际学校2023-2024学年八年级下学期期中数学试题
10 . 先把
因式分解,然后计算求值,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95258f702a965d3750cd8e76f3ae0712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d27f102cbee1717e76535b5ae924731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107babba45f110012183dc4dc54490f7.png)
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