分解因式:
(1)a2b﹣2ab2+b3.
(2)(x2+9)2﹣36x2.
(1)a2b﹣2ab2+b3.
(2)(x2+9)2﹣36x2.
21-22八年级上·山东烟台·期末 查看更多[3]
山东省烟台市莱州市2021-2022学年八年级上学期期末数学试题(已下线)专题14.37 因式分解专题100题(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)山东省济南市莱芜区济宁学院附属中学2023-2024学年八年级上学期期末数学试题(五四学制)
更新时间:2022-07-22 10:57:00
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解答题-计算题
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适中
(0.65)
【推荐1】(1)计算:
;
(2)计算:
;
(3)因式分解:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f19d8f076e42a0cb793276eeabc096.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01643bf3071d7443cb8c34dc22b6455d.png)
(3)因式分解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63654534394aaba4ccbd998d115026b3.png)
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名校
【推荐2】把下列多项式分解因式:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd45d22e887a0f1d93f84e773fbe2f6.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f635055c66a3d8092a91f7d19ee08e5.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03783eb153bdd12fe507c725537603a3.png)
(4)
(十字相乘法)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd45d22e887a0f1d93f84e773fbe2f6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f635055c66a3d8092a91f7d19ee08e5.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03783eb153bdd12fe507c725537603a3.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80eb1f6d7267c2fbf962dbadbb3a2f21.png)
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【推荐2】阅读与思考:分组分解法指通过分组分解的方式来分解用提公因式法和公式法无法直接分解的多项式,比如:四项的多项式一般按照“两两”分组或“三一”分组,进行分组分解.
例1:“两两分组”:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df52d32108add1782ba336d51f529198.png)
解:原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420a0ec37f7b34d9ccb58fd68426ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f35afe4a87d5ea10152ea0e81bf149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa201ddfb7b92a43cf7c8af813371e51.png)
例2:“三一分组”:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cab9fb4261bd5bbd859a3f0bf119fb1.png)
解:原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcd7d58d5bcb4ff95750f44d2dde7a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78ac41f6b990bf8d47314bd20a028ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b7a3c0dbb786b965ad274584b84013.png)
归纳总结:用分组分解法分解因式要先恰当分组,然后用提公因式法或运用公式法继续分解.请同学们在阅读材料的启发下,解答下列问题:
(1)分解因式:①
;②
;
(2)已知
的三边a,b,c满足
,试判断
的形状.
例1:“两两分组”:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df52d32108add1782ba336d51f529198.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420a0ec37f7b34d9ccb58fd68426ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f35afe4a87d5ea10152ea0e81bf149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa201ddfb7b92a43cf7c8af813371e51.png)
例2:“三一分组”:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cab9fb4261bd5bbd859a3f0bf119fb1.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcd7d58d5bcb4ff95750f44d2dde7a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78ac41f6b990bf8d47314bd20a028ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b7a3c0dbb786b965ad274584b84013.png)
归纳总结:用分组分解法分解因式要先恰当分组,然后用提公因式法或运用公式法继续分解.请同学们在阅读材料的启发下,解答下列问题:
(1)分解因式:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fa5a09b8d541d7ab2fec8c3effdbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b306377b4d60fcfcb371cdb455df5db2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337549a218ed82f10e9bcae2523fafab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】(1)已知
,
,求
的值;
(2)已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4d2bcf4cdaab2a07ddf3640bb7ffa.png)
,化简并计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbe0890043f34b4575bf7bb3a773e32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a120e118263f6b9fde8054e1a57479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169d61ac1dfd3ab57db13dfe97da8ecc.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4d2bcf4cdaab2a07ddf3640bb7ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec4f5fec3445bdef5c5e9a9ba1d78d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1a87fe0eb18af127f10dacc87d8b9a.png)
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解答题-计算题
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适中
(0.65)
【推荐2】先阅读下面的内容,再解决问题.
例题:若
,求m和n的值.
解:∵
,
∴
,
∴
,
∴
,
,
∴
,
.
(1)若
,求
的值;
(2)已知a,b,c是等腰
的三条边长,且a,b满足
,求
的周长.
例题:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df0242b1f8d32c7f2381f471b986f69.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df0242b1f8d32c7f2381f471b986f69.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf8ce4817f2a6b7a83904e2f3ec1562.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa8d3a3ba6e168ec087d32bce2d895a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087c617ff25126d2cd6428b2cd62ff47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4242fa3e9046e407e62a7cc614f6912b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc895959e9bc92294dc9dd2263dbf0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88de2ecfaeee019663fa77b7e7291b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
(2)已知a,b,c是等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cc45a7ac34392964216be680cec9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次