1 . 分式方程
的解为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428cb4f5ebc979b907808a0745430826.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . (1)化简:
;
(2)解分式方程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12cbfd7e331521a35d51c75d1e88130a.png)
(2)解分式方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b6de64f355f5eaf3a576e5d072c236.png)
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3 . 分式方程
的解为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a957cae99236734cbac3edf14609b68e.png)
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4 . 若代数式
和
的值相等,则n等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14f98c601c4c3c0ca31baf39b04027e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
A.1 | B.2 | C.![]() | D.![]() |
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5 . 方程
的解为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819982867436b5328b9fad5f5028cc15.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 在跨学科探究学习中,我们发现如下两个公式:如图①,在串联电路中,总电阻R满足
;如图②,在并联电路中,总电阻R满足
.
,
,总电阻为12Ω,求
的值;
(2)如图④,已知
为定值电阻,现有两个电阻
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
,请问如何摆放
和
的位置,能够使得总电阻最小?(在图中填写并证明)
(3)如图⑤,现有三个电阻
、
和
,请问如何摆放这三个电阻,能够使得总电阻最小?(在图中填写,无需证明)
(4)如图⑥,已知
为定值电阻,现有四个电阻
、
、
和
,请问如何摆放这四个电阻,能够使得总电阻最小?(在图中填写,无需证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1326a37dc4cc596e5f23f96036b34f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d2cdc7b545f61c01ef0fe698bac83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a562c5eff1139f52bf0e058d026d512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa76f222313ef76898e531fa401de069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
(2)如图④,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e533d4fb0264cee22a58857342851b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
(3)如图⑤,现有三个电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a01cca947d965d16d6785025465fc98.png)
(4)如图⑥,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d4d277cd409fafa47950cf7ed9e9a9.png)
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7 . (1)解方程:
;
(2)解不等式组:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16105b74d81df3b5ce9c961d0c171c95.png)
(2)解不等式组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf25c535b9e2973967845a1db327a7f.png)
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8 . 方程
的解为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7303024a8df5ac1928ad414ee33f254d.png)
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9 . 解下列方程:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c98f1efa9ca52d2f6b6071ef5e4d8e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fd8162c12f62f1b7ff0b373fca8761.png)
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10 . 方程
的解是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45714bdc85ff56b5be44c8985ca2b951.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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