下列说法错误的是( )
A.数据52000用科学记数法表示为![]() |
B.一元二次方程![]() |
C.三角形的外心是它的三边中垂线的交点 |
D.圆![]() ![]() ![]() ![]() ![]() |
更新时间:2023-01-19 22:11:31
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【推荐1】某大型广场要举办一次能容纳10万人的演出,假设每把椅子所占面积相当于一张单人的学生课桌面积,则这个大型广场的面积约为( )
A.2.5×106m2 | B.2.5×105m2 | C.2.5×104m2 | D.2.5×103m2 |
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【推荐2】2018中国
宁波
特色文化产业博览会于4月16日在宁波国际会展中心闭幕
本次博览会为期四天,参观总人数超55万人次,其中55万用科学记数法表示为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知△ABC的外心为O,连结BO,若∠OBA=18°,则∠C的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3a4cf0ac-ed6e-48b9-8a33-41310da4c6a5.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3a4cf0ac-ed6e-48b9-8a33-41310da4c6a5.png?resizew=136)
A.60° | B.68° | C.70° | D.72° |
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【推荐2】如图,点E是
的外心,以点B为圆心,任意长为半径画弧,分别交
,
于点F,G,再分别以F,G为圆心,大于
长为半径画弧,两弧交于点H;以点C为圆心,任意长为半径画弧,分别交
,
于点M,N,再分别以M,N为圆心,大于
长为半径画弧,两弧交于点K.作射线BH,射线
,
与
交于点D.连接
,连接
,若
,则
的度数为( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/8f15a371-908b-41bd-a7b6-81ddbe27af7f.jpg?resizew=186)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,
是
的内接三角形,
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A.相离 | B.相交 | C.相切 | D.无法确定 |
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【推荐2】⊙O的半径为6,一条弦长
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A.相切 | B.相交 | C.相离 | D.相切或相交 |
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