求值:
(1)已知
,求
的值;
(2)已知
,求
的值.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa1dcdb4a8d83e5e66eabc0aa8e124b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17adeeb0a2f6a0322f89aa7e36e30f99.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccbe63e3acc0e0b92a5642f55b9a867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
22-23七年级下·江苏扬州·期中 查看更多[2]
江苏省扬州市江都区邵樊片2022-2023学年七年级下学期期中数学试卷(已下线)专题03 幂的运算(五大题型)-【好题汇编】备战2023-2024学年七年级数学下学期期中真题分类汇编(苏科版)
更新时间:2023-04-21 22:24:33
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相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】已知
,
.
(1)求
和
的值;
(2)求
;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e145d078afe7f534a279db19b6b1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a79875d449e6584bec3899e8acb0a2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745c100afb56c39c7706fc59aacac0ba.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ebc856291255f2d4a6c20b982a2442.png)
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解答题-计算题
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适中
(0.65)
【推荐2】观察下列各式:
……………①
……………②
……………③
……
探索以上式子的规律:
(1)写出第
个等式.
(2)试写出第
个等式,并说明第
个等式成立.
(3)计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76fac46c2a8053c0eb5888409b2095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71542e0f6a35f1c9e54d1a2f17389cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2782deb0c8c192f9f7497c4a3a9821.png)
……
探索以上式子的规律:
(1)写出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(2)试写出第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6a2fb4b92cf63cf4c9653894329b7f.png)
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名校
【推荐2】(1)已知
,求
的值;
(2)先化简:
,然后在
,0,1,2四个数中给
选择一个你喜欢的数代入求值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80bff2a152a51b587760f16e2ca0ea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)先化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3032a0e056c60c481d056316b6e117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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适中
(0.65)
【推荐1】阅读材料,解决问题.
材料一:比较
和
的大小.
解:因为
,而
,所以
,即
.
小结:在指数相同的情况下,可通过比较底数的大小,来确定两个幂的大小.
材料二:比较
和
的大小.
解:因为
,而
,所以
,即
.
小结:在底数相同的情况下,可以通过比较指数的大小,来确定两个幂的大小.
(1)比较
,
,
的大小:
(2)比较
,
,
的大小.
材料一:比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8545edea9b1a10b2014c4edc533e1683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6892bb636aacbd7fa6f7221bd00f0ef.png)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277ee3109ca2f726fe8b7e172e8031e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170dd8267b8548c81d105f325524d90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ea3f209d2c253bd5e0788e200c5131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef868d82f50a2bb622e1ae28f853243.png)
小结:在指数相同的情况下,可通过比较底数的大小,来确定两个幂的大小.
材料二:比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638ea7f6b269dbc4c39ff46823df3828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784dc24233b6078733a769a5bc929a05.png)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c24be4e682957e9d96ac2d04f65fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8f5ebb1dd7dcf8437190413cf35a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d3e928f974270e7f0dc43aa75e7c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ecacfd4bf2c6a4cb735b38b7300b57.png)
小结:在底数相同的情况下,可以通过比较指数的大小,来确定两个幂的大小.
(1)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2458d4472637a7be8b57a235ce83c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06ea2632ae4bdd3e26924ba70d2cd30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9d58c9b903b25a21fb2e92871caf8a.png)
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b10a6aa12b516791a6dc2b6281226f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a7ee2bcad30ccfc15ef06ad065fb70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1755397ef20d8d090413d57be57458dc.png)
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适中
(0.65)
【推荐2】规定两数a,b之间的一种运算,记作
:如果
,那么
.
例如:
,
.
(1)根据上述规定,填空:
__________,
__________,
__________;
(2)小明在研究这种运算时发现一个现象:
,小明给出了如下的理由:
设
,则
,即
,
,即
,
.
请你尝试运用这种方法判断
是否成立,若成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d74fb8a902e0cbb2a35fc8e364ba069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5557da9a3fa0e05492df7aaa875171f8.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c208b10d2fefedef18d69fbd52edb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf865255aa19e18247691aefb91edfb.png)
(1)根据上述规定,填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e44cdc98e6826c63a63bbf115732ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6b34addb2b6c07f9ef6d5aff005a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0892ca8b0100284c6458359933eafb33.png)
(2)小明在研究这种运算时发现一个现象:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b5ab2b2fa64489102d1ad160b086da.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3b54178a8f57bb224dfded90ca1edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a7b69e718889b5b4639b2bc2b07c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50b8a9f67e9c76eb839286a0e11335b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bf8b57428ddac374984ee899fff1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f0053bb4999e000cb1fad490f935aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573f06d5d576ac84e6ccb1fc898f0408.png)
请你尝试运用这种方法判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc77a645d3cc77ed228edb2880bba643.png)
您最近一年使用:0次