运用整体思想解决数学问题,有时会使我们的解题更加简便快捷.例如:已知
,求
的值.解:
,当
时,原式
.请你借鉴上面的解题经验,解决下列问题:
(1)若
,则
______;
(2)若关于x,y的方程组
的解为
现有关于m,n的方程组
,求代数式
的值;
(3)如图,将
纸片沿
折叠,使点
落在点
的位置.
①如图1,点
在
内部,请你猜想
与
之间有怎样的数量关系,并说明理由;
②如图2,点
在
外部,再将
纸片沿
折叠,点C恰好也落在点N的位置,若
,
,则
____________(用m、n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba8a4b6fbfa194a07c0d5f0b1bd1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ebd1734ead1220ff0d0612da32d5e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3871379335c3c9409c7369abbba586c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba8a4b6fbfa194a07c0d5f0b1bd1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e11a2420bcb32522881aaeddb404f3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d873405c90a3e9bc1b8f52bcd2852e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90fc65dd9360c2ded167df709b047ca.png)
(2)若关于x,y的方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a72c1f09c4b571d6f261f86f9d3b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485874402b318268aa6ef0eadf270a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4df998f4e31d587f10e9304a74f73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b2029464b8dac1e192ccfa5e9c0266.png)
(3)如图,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1abfc5f8a68337146228441531d442.png)
②如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a0a79991aec8c223a3220f3631e8ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c9b63df0ce09985f60de859b55a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7cbe31f9c11d236c7c9611f207f465.png)
更新时间:2024-05-08 07:55:49
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解答题-计算题
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【推荐1】计算:
(1)(2x-1)2-2(x+3)(x-3);
(2)(2a-b+3)(2a-3+b).
(1)(2x-1)2-2(x+3)(x-3);
(2)(2a-b+3)(2a-3+b).
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【推荐1】善于思考的小明在解方程组
时,采用了一种“整体代换”的思想.
解法如下:将方程
变形为:
③
把方程①代入③得,
,则
;把
代入①得,
,
所以方程组的解为:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646466a959ebff9c62eca9357db7ec1e.png)
请你运用“整体代换”的思想解决下列问题:
(1)解方程组
;(2)已知
、
、
满足
,试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc7dfdb5bfdf6aa901d198a7e5d9ec8.png)
解法如下:将方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d08ad64015f964fc3b481f92e062ca56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a2405dddc0d55eca398df42c8d3ddb.png)
把方程①代入③得,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c548b7c0c75a8a3734b5c3ba8e44787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefa44964db83759aff6fc8dd7ef8f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefa44964db83759aff6fc8dd7ef8f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
所以方程组的解为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646466a959ebff9c62eca9357db7ec1e.png)
请你运用“整体代换”的思想解决下列问题:
(1)解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde1120c71fd24f1b6f4a5c6b1fd67c4.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/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b712da3156b94eea99d9dd56946add4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
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【推荐2】阅读下列材料:
小明同学在学习二元一次方程组时遇到了这样一个问题:解方程组
,小明发现如果用代入消元法或加减消元法求解,运算量比较大,容易出错.如果把方程组中的
看成一个整体,把
看成一个整体,通过换元,可以解决问题.以下是他的解题过程:
令
,
.
原方程组化为
,
解得
,
把
代入
,
,
得
,
解得
.
∴原方程组的解为
.
请你参考小明同学的做法解方程组:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcbe6f668dd88f5441cefb64c802e62.png)
(2)
小明同学在学习二元一次方程组时遇到了这样一个问题:解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c4836c8c1f46913157aa451c33c622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71aeb4a5d4e6111fa3eae4946df2d276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7934411633d20fe1fae8aecc1deea5.png)
令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4da829fc95d94d5e389292986adc1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4e81ad7b9af2847477f305be2dd6e9.png)
原方程组化为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba68628ca6b2300b070d4bdb2ed465a7.png)
解得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b66a57743359c1f242507575f80cc.png)
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b66a57743359c1f242507575f80cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4da829fc95d94d5e389292986adc1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4e81ad7b9af2847477f305be2dd6e9.png)
得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dcd5b400becae0152e871d0ced724a.png)
解得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee504775a83a37035b061c0c1f42d77.png)
∴原方程组的解为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee504775a83a37035b061c0c1f42d77.png)
请你参考小明同学的做法解方程组:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcbe6f668dd88f5441cefb64c802e62.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1dd405ba8a3aa6375b1df1392b655a.png)
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【推荐1】如图1,已知三角形
,
是线段
延长线上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/49df5bbd-5f7f-4dd8-8337-f7e431fef3c9.png?resizew=441)
(1)求证:
;
(2)如图2,过
作
交
于
,
平分
,
平分
,若
,求
的度数;
(3)如图3,
,点
为线段
上一点,点
为射线
上一动点,线段
,
分别交
于点
、
,其中
,
,又过
作
,则
与
的数量关系是____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/49df5bbd-5f7f-4dd8-8337-f7e431fef3c9.png?resizew=441)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31caeba1a39be7f31dc591d905a52381.png)
(2)如图2,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5837d15f8e3aa145ec2587e9447b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5c4253bdb0cd70c706d6d1fa554218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b177008fe21567efaaa9fbaccbde86aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e7a45fb5a0af091fa05b9cfec32a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2107056613aa00b19284dd36d4cbf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e7f693dc2591a216661da251ec77fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d142c80bf7ba01243bcf4fc15d4020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958e7abd79a73e20a4629233d7b42e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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【推荐2】如图,
中,
,
,
的角平分线
交
于点E.点D为
上一点,且
,
,
交于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/f0e0883a-cf34-47fa-a192-532a5cc3882a.png?resizew=179)
(1)求
的度数;
(2)若
于点H,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf3bb6fc265edb63e78dab2a6dd3bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/f0e0883a-cf34-47fa-a192-532a5cc3882a.png?resizew=179)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a433a47da376e4a3f66af52b63351f84.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6f584802de2e7335d5b6ba33c9ac50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
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【推荐1】如图,在
中,点D为
上一点,将
沿
翻折得到
,
与
相交于点F,若
平分
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898374148202496/2957043001991168/STEM/8886ea62-e297-43ec-90f7-8864a3009f48.png?resizew=281)
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a427709e6575431882877cda3b59ca.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898374148202496/2957043001991168/STEM/8886ea62-e297-43ec-90f7-8864a3009f48.png?resizew=281)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dc0c42bfc024c1be6c4dd309d49bb9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
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【推荐2】如图1,
是
的外角,
与
的角平分线交于点
.
(1)若
,
,则
°,
°;
(2)探索
与
的数量关系,并说明理由;
(3)如图2,将
纸片沿
折叠,使点
落在点
处,且
平分
,
平分
,若
,则
的度数为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/327a6932-14c7-410d-99f7-da58312f2735.png?resizew=313)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c29599014e22e2c5c57f456967f008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2a063b57a3bf82b4428db2e3c17470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2a8bf5e05a07c93a7104839fc21849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b196ad4dc747f411262dbe23b15da1.png)
(2)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97285f9b02878e22a071e97fdb3f8a8.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b54a931a94909ccbc54a8448eb086c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4678ff1b3ea3bd09ed3494a0efe31c.png)
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