操作与探究
(1)如图1,在边长为a的正方形正中间剪去一个边长为b的小正方形
,把剩下的部分按照图中的线段分割成四个等腰梯形,将四个等腰梯形拼成一个大平行四边形.剪拼前后的两个图形可以验证的乘法公式是__________(填序号).
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194c8e87fbce2ab6bae776f4631414fa.png)
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d128508f04e0de9d15f1918d03e75d49.png)
思考与创新
(2)利用上面得到的乘法公式解决问题:
①已知
,
,求
的值;
(1)如图1,在边长为a的正方形正中间剪去一个边长为b的小正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0e9eb0e7e28e2fa60c267e6733cf36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d351a97edcc0783d8d7a02d041bdb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194c8e87fbce2ab6bae776f4631414fa.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065ba628ff941de20a0bef5746ea7940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d128508f04e0de9d15f1918d03e75d49.png)
思考与创新
(2)利用上面得到的乘法公式解决问题:
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8641de131e86041bb4cee948569cdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769444ef5adc372ab8c78caa100472d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
②(任选其一)模仿图1,任选图2或图3用割拼的方法在左边内画图验证(1)中得到的乘法公式成立(画的图形中标注a、b)
23-24八年级上·辽宁大连·阶段练习 查看更多[3]
辽宁省大连市中山区大连嘉汇中学2023-2024学年八年级上学期12月月考数学试题(已下线)专题1.12 平方差公式(知识梳理与考点分类讲解)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)山东省枣庄市滕州市龙泉街道滕东中学2023-2024学年七年级下学期第一次月考数学试题
更新时间:2023-12-30 22:03:15
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【知识点】 平方差公式与几何图形解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,已知并排放置的正方形
和正方形
的边长分别为
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
, A、B、E三点在一直线上,且正方形
和正方形
的面积之差为 12.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/2431e42e-eedf-4c7c-a757-aed7f6b14e0e.png?resizew=139)
(1)用含有
、
的代数式,表示图中阴影部分的面积;
(2)
、
,则四边形
的面积是多少?
(3)图中正方形
绕点B顺时针旋转
后的对应图形
, 连接
、
,若四边形
的面积是
,求
、
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.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/94ce41c1548ce8cfb04284ad9768878a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/2431e42e-eedf-4c7c-a757-aed7f6b14e0e.png?resizew=139)
(1)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68edd1a8e6746d55b632f78552e0540.png)
(3)图中正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a639bcfc9a3f0acde45b26e9f8d2fbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e60c2ca5725d220ea442c4244faeb4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edb7865797f81851ee70d50b659133b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/a2531a89-7a63-4979-a5c3-d4fa93fc322b.png?resizew=163)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在边长为a厘米的正方形的四个角各剪去一个边长为b厘米的小正方形.
(1)用代数式表示剩余部分的面积;
(2)当a=8.68,b=0.66时,求剩余部分的面积.
(1)用代数式表示剩余部分的面积;
(2)当a=8.68,b=0.66时,求剩余部分的面积.
![](https://img.xkw.com/dksih/QBM/2019/1/13/2117786837991424/2118638615863297/STEM/82aca29387274c20b51841ad9ce56907.png?resizew=101)
您最近一年使用:0次