如图,函数y=ax2+bx+c(a,b,c为常数,且a≠0)经过点(﹣1,0)、(m,0),且1<m<2,下列结论:①abc>0;②0<
<
;③若点A(﹣3,y1),B(3,y2)在抛物线上,则y1<y2;④a(m﹣1)+b=0.其中结论正确的有( )个.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228098125373440/2230142142513152/STEM/3b6dfd50c7ac43c19af968e12d7446ea.png?resizew=168)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b268d9d6d4cc23f3692bad62a81e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228098125373440/2230142142513152/STEM/3b6dfd50c7ac43c19af968e12d7446ea.png?resizew=168)
A.4 | B.3 | C.2 | D.1 |
2019·湖北孝感·二模 查看更多[2]
更新时间:2019-06-21 06:18:42
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【推荐1】如图,抛物线
与x轴交于C、D两点(点C在点D的左侧),顶点在线段
上运动,
轴,
,
,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5cda2a53-598c-42c6-a2d6-2cec33b452ae.png?resizew=198)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8794fdd5b979fa369ac350d063f631d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351e22c5f4e9864c27fe01f166a771a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5cda2a53-598c-42c6-a2d6-2cec33b452ae.png?resizew=198)
A.![]() | B.当![]() |
C.![]() | D.若点C的坐标为![]() ![]() |
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【推荐2】对于函数
,下列说法
①图象关于
轴对称;
②有最小值
;
③当方程
有两个不相等的实数根时,
;
④直线
与函数
的图象有三个交点时,
正确的有个( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a1d5a4183f00099c86feb328c9b935.png)
①图象关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②有最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
③当方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29ba358e6f6ea71db62e7783f185e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c698cdb6982beeaa266ac9170cabd4.png)
④直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a657a982027002c53ac3540792130b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041baffbc60db73ec82f7ee574427818.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】(广东省汕头市2018年中考数学模拟试卷(二))在同一坐标系中,一次函数y=ax+1与二次函数y=x2+a的图象可能是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若函数y=x2(x≥0)的图象与直线y=kx+k+1有公共点,则k的取值范围是( )
A.k≤0 | B.k≤-1 | C.k≥-1 | D.k为任意实数 |
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