如图
是一个长为
,宽为
的长方形,沿图中虚线用剪刀平均分成四块小长方形,然后用四块小长方形拼成一个如图
的图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/50116b0a-7c24-42f2-bd4d-ed6d9445c37b.png?resizew=366)
(1)观察图形,请你写出
、
、
之间的等量关系式;
(2)若
,利用(1)中的结论,求
的值;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2a7b13d95229e2e938514739054541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/50116b0a-7c24-42f2-bd4d-ed6d9445c37b.png?resizew=366)
(1)观察图形,请你写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852e23a0022ffca4e65022de59697c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d966d2f37a11dc6c1e6fbb411b588fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5676f7b5b8e00dc101dd5850806e0fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43650cd04f9c5c3ad73ded787df0f2a6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569680df2aaf6258e6be7af1eab19629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3cd006881f6c2a612c0dee31d780b5.png)
更新时间:2022-07-17 12:29:58
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】阅读:若
满足
,求
的值,
解:设
,
,则
______,
______,所以
______.
请仿照上例解决下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/157c8def-7d62-4cbe-89ca-885219e46ca2.png?resizew=159)
(1)补全题目中横线处:
(2)已知
,求
的值;
(3)若
满足
,求
的值;
(4)如图,正方形
的边长为
,
,
,长方形
的面积是400,四边形
和
都是正方形,
是长方形,求图中阴影部分的面积(结果必须是一个具体数值).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd34d6679a0547e7aa0feb56f8602c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5d51e17eacd160a505976294a1d1b2.png)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797ab279d597f2db7cac120beb6b7e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4ba7e44a8a71867ee503fcd55f0801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db100e5b7780a352b1fa28bced8e333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14adaa7705640eeedda69c78b11bc528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2997a3b64253717f3bb9826ccb0cfa4.png)
请仿照上例解决下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/157c8def-7d62-4cbe-89ca-885219e46ca2.png?resizew=159)
(1)补全题目中横线处:
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d8dcb085e0c5cedd1a090bc78d8557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ee4caed6cbbb107415939d1a04abde.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8c34207ffcee906d0983cd8bb3a31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b700de1ba265083f685062f29d151cd.png)
(4)如图,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5967bec6a3d3648b5bc59c12e492ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f515246d9ee093bfbf9983fd47357d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060b114e21d0f6ff11b9391f9a77f3cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd5e1e479972f2b5ec84cf00e85a9b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013e00092604241a46e42342a8cb326c.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】两个边长分别为
和
(
)的正方形按如图1所示的方式放置,其未叠合部分(阴影)面积为
,若再在图1中大正方形的左下角摆放一个边长为
(
)的小正方形(如图2),两个小正方形叠合部分(阴影)面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ddcf4ff2-7c10-4ff2-8ae2-ab0ade03bd16.png?resizew=462)
(1)用含
、
的代数式分别表示:
,
;
(2)若
,
,求
的值;
(3)当
时,求出图3中阴影部分的面积和(即
的值).
![](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/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3899f070e94aae45dcfc1882e59b3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ddcf4ff2-7c10-4ff2-8ae2-ab0ade03bd16.png?resizew=462)
(1)用含
![](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/b3dabace330ccdd9755fbcf32d5d6343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1b625192d7398634a02ea24fa78ed87.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b5e49102150ea3570b9f2b983ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d3519124747c812acb13832eb16056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277744d92733aa7fad684290561fcb80.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79748bd8ac0b49f11558d132cdd815e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dba79c3c9dfbe299bad3cdd6cb5d7cdc.png)
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解答题-问答题
|
适中
(0.65)
【推荐3】完全平方公式:(a±b)2=a2±2ab+b2适当的变形,可以解决很多的数学问题.
例如:若a+b=3,ab=1,求a2+b2的值.
解:因为a+b=3,ab=1,所以(a+b)2=9,2ab=2
所以a2+b2+2ab=9;得a2+b2=7
根据上面的解题思路与方法,解决下列问题:
(1)若x+y=6,x2+y2=30,求xy的值;
(2)请直接写出下列问题答案:
①若3a+b=7,ab=2,则
= ;
②若(3﹣x)(5﹣x)=8,则(3﹣x)2+(5﹣x)2= .
(3)如图,点C是线段AB上的一点,以AC,BC为边向两边作正方形,设AB=10,两正方形的面积和S1+S2=76,求图中阴影部分面积.
例如:若a+b=3,ab=1,求a2+b2的值.
解:因为a+b=3,ab=1,所以(a+b)2=9,2ab=2
所以a2+b2+2ab=9;得a2+b2=7
根据上面的解题思路与方法,解决下列问题:
(1)若x+y=6,x2+y2=30,求xy的值;
(2)请直接写出下列问题答案:
①若3a+b=7,ab=2,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af843f03248254832458e9a803d8bc1.png)
②若(3﹣x)(5﹣x)=8,则(3﹣x)2+(5﹣x)2= .
(3)如图,点C是线段AB上的一点,以AC,BC为边向两边作正方形,设AB=10,两正方形的面积和S1+S2=76,求图中阴影部分面积.
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