一直a、b、c是
的三边长,且使得
成立,请确定
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd4a92746fe9f15f899db1914a213be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
23-24八年级上·四川巴中·期中 查看更多[2]
四川省巴中市平昌县平昌中学实验学校2023-2024学年八年级上学期期中数学试题(已下线)专题02 整式的乘法与因式分解(十三大题型)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(山东专用)
更新时间:2023-11-27 08:37:38
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【推荐1】已知多项式
,甲同学看错了常数项,分解因式为
,乙同学看错了一次项系数,分解因式为
,请求出正确的因式分解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c180b33e94b96e46ec7a4670d6754874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfbd4e005da179d21d789259579c539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b15c67c36610221124f432bceb263b2.png)
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【推荐2】某校数学社团的小亮、小颖两个同学利用分组分解法进行的因式分解:
小亮:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1786b408b6152e0ee429327d5e944f26.png)
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbeff547859c1140630008eddf9dc7b.png)
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1139a8f4a8ff103bab5aaabc31e0a19.png)
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d4912be0485c82e365f738918eee01.png)
小颖:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8655d76a06f40c54fd1987add865301b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32f1f4f184fa245e98e38f21d8e0040.png)
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef1a3be43d6981b1097f8441062a312.png)
.
请你在他们解法的启发下,解决下面问题;
(1)因式分解
;
(2)因式分解
;
(3)已知a,b,c是
的三边,且满足
,判断
的形状并说明理由.
小亮:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1786b408b6152e0ee429327d5e944f26.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbeff547859c1140630008eddf9dc7b.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1139a8f4a8ff103bab5aaabc31e0a19.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d4912be0485c82e365f738918eee01.png)
小颖:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8655d76a06f40c54fd1987add865301b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32f1f4f184fa245e98e38f21d8e0040.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef1a3be43d6981b1097f8441062a312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b4e088aadaafaf6848ee8106f91d3e.png)
请你在他们解法的启发下,解决下面问题;
(1)因式分解
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe26883fead4860f12f424e0ae5c6a3.png)
(2)因式分解
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ce2c2bd703005a29a3de0d2afc2bd5.png)
(3)已知a,b,c是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0ed90d22a8b0bb7268fb89125037eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
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【推荐3】阅读与思考:在现今信息化时代,智能手机几乎人手必备,应用到了生活的各个领域,锁屏密码为保护我们个人隐私起到了不可或缺的作用,而诸如“1234”、生日等简单密码又容易被破解,因此利用简单方法产生一组容易记忆的密码就很有必要了.有一种用“因式分解”法产生的密码,方便记忆,其原理是:将一个多项式分解因式,如多项式;
因式分解的结果为
或
,取个人年龄作为x的值,当
时,
,
,此时可以得到数字密码1016或1610.
(1)根据上述方法,若多项式为
,当
时,求出锁屏密码;
(2)若王老师选取的多项式为
,已知王老师手机的锁屏密码是6位数字353334,请尝试分析王老师当前年龄是多少岁,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649e5f149f03b01d3fcd3a279129da47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e8caefc1a25b511bad637e49ee4a68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d83377d7d2e1e44156966aa9acbdd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bbc1205da581e3afaf6b3286c3c641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc39c3047c7bd624db089a07363b2d05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149b4bd140d7a27a5136ab4cf74b2fc4.png)
(1)根据上述方法,若多项式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1c6f94e7c4180473bbebe81e2de031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a6f3846904b1a225ee1d3d7d491cbb.png)
(2)若王老师选取的多项式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f8f25f22f66e14cc102b2ebbc9398e.png)
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名校
【推荐1】 已知点
和点
在线段
上,且
,
,
,
和
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f9f588a9-01dd-47a4-9a72-063bddd6bf97.png?resizew=145)
求证:
;
当
,猜想
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f74a2f61d78627296fac510313d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7adadb7362f2aaad279414eea3de77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427e2f848323b4c156e7460ebf948009.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a3a3d168a18401e47576f70a692e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28874ad3b1332d5121bea77e10dc1e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4553a3034f89da311519cd866a0a3cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f9f588a9-01dd-47a4-9a72-063bddd6bf97.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0239bdc32f5df40607674b81a82ec9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2105c2f52ee73dbda37a571cbd16bdf.png)
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