如图,菱形ABCD的边长是5,两对角线交于点O,且AO、BO的长分别是关于x的方程x2+(2m+1)x+m2﹣4=0的两根,则m为( )
![](https://img.xkw.com/dksih/QBM/2021/9/6/2802041280266240/2802310807748608/STEM/ca919b229d3d41bdbb87ed9df4b2e439.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/2021/9/6/2802041280266240/2802310807748608/STEM/ca919b229d3d41bdbb87ed9df4b2e439.png?resizew=131)
A.﹣4 | B.2 | C.2或﹣4 | D.﹣2或4 |
20-21九年级上·四川德阳·阶段练习 查看更多[2]
更新时间:2021-09-09 15:02:08
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【推荐1】若关于x的一元二次方程kx2﹣4x+3=0有实数根,则k的非负整数值是( )
A.1 | B.0,1 | C.1,2 | D.1,2,3 |
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【推荐2】关于
的方程
有两个不相等的实数根,则
的取值范围是( )
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573953956823040/1573953962745856/STEM/7f427bb22f6246118f4afdb7435cea81.png)
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573953956823040/1573953962745856/STEM/2308eb7ecc1043049bff0098f040af9f.png)
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573953956823040/1573953962745856/STEM/a64534d514f543bb8d60c60cf05d2b67.png)
A.k>-1 | B.k≥-1 | C.k<-1 | D.k≤-1 |
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名校
【推荐1】如图,菱形
的对角线
、
相交于点
,
,
,则边
与
之间的距离为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/d2f1b1bf-d3ca-44e8-b034-a730e18116b2.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在正方形纸片
中,对角线
、
相交于点
,折叠正方形纸片
,使
落在
上,点
恰好与
上的点
重合,展开后,折痕
分别交
、
于点
、
,连接
,有以下结论:①
;②
;③
;④四边形
是菱形;⑤
,其中正确结论的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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