2022高一·全国·专题练习
1 . 如果
,
,那么代数式
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719aa8007c1e57e702316fcfdbddcd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57fc71a771efa8dbfe45f8558227720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e99fa854b7cdb859d5884cb423ff93.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022高一·全国·专题练习
2 . 如图,点
在数轴上表示的数分别为
,且
,则下列结论中:(1)
;(2)
;(3)
;(4)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b447c74fa1db0b867704084390ad656.png)
其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/0f0f6e0b-a168-44b1-8859-df3c8e86529b.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1226beb2ac379db8c590df828e067437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66de7b3666fba7c2ea8850a099226f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0eb95d5389665beded59011f0dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b447c74fa1db0b867704084390ad656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/0f0f6e0b-a168-44b1-8859-df3c8e86529b.png?resizew=193)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 中国古塔多为六角形或八角形.已知某八角形塔的一个水平截面为正八边形ABCDEFGH,如图所示,若
,则
( )
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927640639815680/2929143711342592/STEM/ce1eac8337444b3ba67a4a2a99a02d5d.png?resizew=134)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f77f0f76455ffe14e81e7ce79bc019.png)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927640639815680/2929143711342592/STEM/ce1eac8337444b3ba67a4a2a99a02d5d.png?resizew=134)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 下列等式中,属于恒等式的是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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2022高三·全国·专题练习
5 . 小孟进了一批水果,如果他以每千克1.2元的价格出售,那他就会赔4元,如果他以每千克1.5元的价格出售,一共可赚8元.现在小孟想将这批水果尽快出手,以不赔不赚的价格卖出,那么每千克水果应定价为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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