先化简,再求值:
,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8352961ca8a3c2447b4ef8e52cda57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea392515abeb8ffae9bc15c93c807407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1729d766f56cadd405bc12d57bcb1e4f.png)
23-24八年级上·吉林长春·阶段练习 查看更多[3]
吉林省长春市榆树市八号镇中学校2023-2024学年八年级上学期9月月考数学试题吉林省长春市南关区新解放学校2022-2023学年八年级上学期期末数学试题(已下线)专题14.26 用乘法公式运算100题(分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)
更新时间:2023-09-24 14:54:26
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【推荐2】如图所示,从边长为a的正方形中剪掉一个边长为b的正方形(图①),然后将剩余部分拼成一个长方形(图②).
A.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9282cc1d750ee3d7ecd9f148d3ab3d.png)
B.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e3f2b96b28e665536f63e9f69450cd.png)
C.
(2)若
,
,求
的值.
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9282cc1d750ee3d7ecd9f148d3ab3d.png)
B.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e3f2b96b28e665536f63e9f69450cd.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c560c67a0dc3c21aa8905cd7684dfd7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874e8ea83c58748f4f1091b07804d93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b9442c77f394e24f722e626d85d249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
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