先化简,再求值
(1)已知
,求代数式
的值.
(2)已知
为正整数,且
,求
的值.
(3)若
、
满足
,
,求下列各式的值.
①
;
②
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf913c92060a7bad4de1ee8c04d011e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff27eee2418f96cba3b9624dfd9563b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b21f47a17fce09eaeee350672470bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8775cf7b6e71b3dbf59374ea8a12b9.png)
(3)若
![](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/e20ab6c8b4ac20cae991969a596eb1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ae201380896f47a2ac1a4a48374f5f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e967af94ba531213c946d76c4357846.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc8ae130f20b24fb5a20fe6522188d0.png)
2023七年级下·全国·专题练习 查看更多[1]
(已下线)8.2幂的乘方与积的乘方 重难点专项练习【七大题型】-2022-2023学年七年级数学下册同步精品课堂(苏科版)
更新时间:2023-03-19 21:59:32
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【推荐1】已知,若实数a、b、c满足等式
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-计算题
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【推荐2】由幂的运算法则逆向思维可以得到
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b1495c0bf168267adb8cde0bf2db22.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba30e1f2b71fd2ebfb0d9347976f4b2.png)
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【推荐2】先化简,再求值:已知x,y满足|2x+1|+(y+1)2=0,求代数式[(x2+y2)-(x-y)2+2y(x-y)]÷(-2y)的值.
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【推荐2】观察下列等式并回答问题
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解答题-问答题
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适中
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【推荐1】阅读与思考
任务:
(1)填空:已知
,只有当
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下面是小米同学的数学笔记,请仔细阅读并完成相应的任务. 如果 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 例题:当 ![]() ![]() 解:令 ![]() ![]() ![]() ![]() ∴ ![]() 故当 ![]() ![]() |
(1)填空:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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(2)如图,P为双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f677dbb874b8286dde3f608ae85a9e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e7c6d54b0d73fa8d3af7f2a4d7f049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31940149def6907c303bb48f25fd6bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/364bb26c-61a9-4b58-bbbc-1019043ff39b.png?resizew=226)
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