观察下列分解因式的过程:
解:原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eead183ba267988368519c5596482ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3fdeced8499263f71a2d2faf3b3c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2471ea2a9ccb248079f00b082bd2c1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f423503a0c8d1ef10684d32d52ed0ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c9eaade73a5d21272183587a7b72f7.png)
像这种通过增减项把多项式转化成完全平方形式的方法称为配方法.
(1)请你运用上述配方法分解因式:
;
(2)已知
的三边长
都是正整数,且满足
,求
周长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2fc9044865f3ab5c9405fba33679d9.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eead183ba267988368519c5596482ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3fdeced8499263f71a2d2faf3b3c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2471ea2a9ccb248079f00b082bd2c1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f423503a0c8d1ef10684d32d52ed0ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c9eaade73a5d21272183587a7b72f7.png)
像这种通过增减项把多项式转化成完全平方形式的方法称为配方法.
(1)请你运用上述配方法分解因式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a049c2075683a3d1e5a1d6ad4de0a9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f81b2dc00e899ef953ee38547112620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
23-24八年级上·四川资阳·期中 查看更多[4]
四川省资阳市乐至县乐至中学2023-2024学年八年级上学期期中考试数学试题河南省周口市淮阳区2023-2024学年八年级上学期期中数学模拟试题3(已下线)第06讲 因式分解的应用-【帮课堂】2023-2024学年八年级数学上册同步学与练(人教版)(已下线)猜想04整式的乘法与因式分解(易错必刷30题10种题型专项训练)-2023-2024学年八年级数学上学期期末考点大串讲(人教版)
更新时间:2023-10-28 19:25:01
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【推荐1】我们定义:一个整数能表示成
(
、
是整数)的形式,则称这个数为“完美数”,例如,5是“完美数”,理由:因为
,所以5是“完美数”.
【解决问题】
(1)已知29是“完美数”,请将它写成
(
、
是整数)的形式__________;
(2)若
可配方成
(
、
为常数),则
__________;
【探究问题】
(3)已知
,则
__________;
(4)已知
(
、
是整数,
是常数),要使
为“完美数”,试求出符合条件的一个
值,并说明理由.
【拓展结论】
(5)已知实数
、
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.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/aa0f7368432b977563895c2d28862766.png)
【解决问题】
(1)已知29是“完美数”,请将它写成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178d0ab9417a5f9ad9d2cd324612d642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67d24abeac8cd19e718bd0289ee31a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f99e6e10e61af2e7734c4d01ea90c.png)
【探究问题】
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af860678725c6ea1c72d33416d436fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bec55c3826d2d5adee734c2ce790c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
【拓展结论】
(5)已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1d85392bd7b1b1150e96e3240bc804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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【推荐2】阅读:分解因式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527ed5ec08bfac2d403309c2ee8256b6.png)
解:原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914ec77794c683d62a0065bc6816f74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15c80972d9c292cfcd1f3dd52697607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf49365126151f6be4777dc41c1eec03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f37f2d588844116814f3bf5e475cdaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d7523f377d4105ac7af80be496e174.png)
此方法是抓住二次项和一次项的特点,然后加一项,使这三项为完全平方式,我们称这种方法为“配方法”,此题为用配方法分解因式.
请体会配方法的特点,然后用配方法解决下列问题:
在有理数范围内分解因式:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527ed5ec08bfac2d403309c2ee8256b6.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914ec77794c683d62a0065bc6816f74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15c80972d9c292cfcd1f3dd52697607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf49365126151f6be4777dc41c1eec03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f37f2d588844116814f3bf5e475cdaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d7523f377d4105ac7af80be496e174.png)
此方法是抓住二次项和一次项的特点,然后加一项,使这三项为完全平方式,我们称这种方法为“配方法”,此题为用配方法分解因式.
请体会配方法的特点,然后用配方法解决下列问题:
在有理数范围内分解因式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19281b38b66d9e2bfc49734563dd6cf7.png)
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【推荐1】先阅读下面的内容,再解决问题,
例题:若
,求m和n的值.
解:因为
,
所以
.
所以
.
所以
.
所以
.
问题:
(1)若
,求
的值;
(2)已知a,b,c是等腰
的三边长,且a,b满足
,求
的周长.
例题:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df0242b1f8d32c7f2381f471b986f69.png)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df0242b1f8d32c7f2381f471b986f69.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf8ce4817f2a6b7a83904e2f3ec1562.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa8d3a3ba6e168ec087d32bce2d895a.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23278eab9ba1635db310fb50bd3062.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbaf5800bac50bcbc60c6132e0418bcb.png)
问题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9f846eb8a45f693b4d722e3dc6e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
(2)已知a,b,c是等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b6ff9652408b48232e4d9605e62ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐2】已知
相交于点O,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/eb981fa1-942e-4c7b-ba0b-cd05df61caa7.png?resizew=276)
(1)求证:
;
(2)连接
,若
,
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9e4d17931d5f0e4a448903d1a1cfe5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/eb981fa1-942e-4c7b-ba0b-cd05df61caa7.png?resizew=276)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833003cfb9b4fa0b99be6f48e9cd0e75.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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