平面直角坐标系中,点A坐标为
,B是x轴正半轴上一点,
,则点B的坐标是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-08-19 11:37:41
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【推荐1】如图是由若干个相同的小正三角形组成的图形,小明在该图形中建立了平面直角坐标系,并测得点A的坐标是
,点B的坐标是
,由此可知、点C的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80b4b617b5d95739ee76d4b7d246966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7597c6e4b7c7215651b1ef03bf2c1e11.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】函数
与
的图像如图,有以下结论,正确的有( )个.
①
;②
;③当
时,
;④
.
![](https://img.xkw.com/dksih/QBM/2022/12/6/3125161583198208/3270167565312000/STEM/76a3e664908045ec97c0d1e9cc1dac36.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5796f99bdb2e17f5939da3cc5e5ea19c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9978c001bac0f26b67b4a6412a1d168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0345ad2eb83035986f0ad4d3abaa44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b21c35767d0e159b15a3769c3941132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e184a9fd17a68b10b662aa68c76993ec.png)
![](https://img.xkw.com/dksih/QBM/2022/12/6/3125161583198208/3270167565312000/STEM/76a3e664908045ec97c0d1e9cc1dac36.png?resizew=164)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】将等腰直角三角形AOB按如图所示放置,然后绕点O逆时针旋转90°至△A′OB′的位置,点B的横坐标为2,则点A′的坐标为( )
![](https://img.xkw.com/dksih/QBM/2015/10/27/1573922645868544/1573922652004352/STEM/2aea7f5e7a4541bc9f7b70a11502a1aa.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1573922645868544/1573922652004352/STEM/2aea7f5e7a4541bc9f7b70a11502a1aa.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,在△ABC中,∠ABC=90°,BD为AC的中线,过点C作CE⊥BD于点E,过点A作BD的平行线,交CE的延长线于点F,在AF的延长线上截取FG=BD,连接BG、DF.若AC=AF+2,CF=6,则四边形BDFG的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/00304e1c-9f68-4dec-87e5-a48f39550bae.png?resizew=300)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/00304e1c-9f68-4dec-87e5-a48f39550bae.png?resizew=300)
A.19 | B.20 | C.25 | D.26 |
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