如图,在平面直角坐标系中,抛物线y=ax2+bx+5经过A(2,5),B(﹣1,2)两点,若点C在该抛物线上,则C点的坐标可能是( )
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915818319872/1573915824455680/STEM/bdf3d9608ba343c8a54ea482f180fcf5.png)
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915818319872/1573915824455680/STEM/bdf3d9608ba343c8a54ea482f180fcf5.png)
A.(﹣2,0) | B.(0.5,6.5) | C.(3,2) | D.(2,2) |
更新时间:2015-09-24 16:54:29
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【知识点】 y=ax²+bx+c的图象与性质解读
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单选题
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较易
(0.85)
【推荐1】下列关于抛物线
的说法正确的是( )
①开口方向向上;②对称轴是直线
;③当
时,y随x的增大而减小;④当
或
时,
; ⑤二次函数的最小值是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0781a9acdedd45dbdf6855f91ead86.png)
①开口方向向上;②对称轴是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6d82d173ad18cc040e94c925b5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752455799e49f846e2601304fec5d3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
A.①③⑤ | B.①④ | C.①③④⑤ | D.①②③④⑤ |
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单选题
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较易
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【推荐2】二次函数
图象上部分点的坐标满足下表:
则该函数图象上的点
,
则下列选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59294edb914b00992d6676a5c127613c.png)
x | … | ![]() | ![]() | ![]() | 0 | 1 | … |
y | … | 0 | ![]() | 0 | 3 | 8 | … |
则该函数图象上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefc45b91bea39383e50d142a5e0d3c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd76cf3bec5d8cde849335ff142b40e0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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