1/5单选题
难度：
1.已知二次函数y=ax2+bx+c（a＜0）的图象如图所示，当-5≤x≤0时，下列说法正确的是（ ）
| A | 有最小值-5、最大值0 |
| B | 有最小值-3、最大值6 |
| C | 有最小值0、最大值6 |
| D | 有最小值2、最大值6 |
- 提示1：
- IOWwhjxpbWcgd2lkdGg9NzkgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNTMvckJBQ0ZGTU1VVnZBNXZhN0FBQUJ0QndiWUIwMDEzLnBuZyI+56Gu5a6a5a+55bqU5Zu+5YOP5LiK55qE6YOo5YiG
正确答案：Qg==
PGRpdj4xLueUseS6jOasoeWHveaVsOeahOWbvuixoeWPr+efpe+8jDwvZGl2PjxkaXY+4oi1PGltZyB3aWR0aD03OSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC81My9yQkFDRkZNTVVWdkE1dmE3QUFBQnRCd2JZQjAwMTMucG5nIj7vvIw8L2Rpdj48ZGl2PuKItOW9k3g9LTLml7blh73mlbDmnInmnIDlpKflgLzvvIx55pyA5aSnPTbvvJs8L2Rpdj48ZGl2PuW9k3g9LTXml7blh73mlbDlgLzmnIDlsI/vvIx55pyA5bCPPS0zLiA8L2Rpdj4=
2/5单选题
难度：
2.二次函数y=ax2+bx+c，b2=ac且x=0时y=-4，则（ ）
| A | y最大=-4 |
| B | y最小=-4 |
| C | y最大=-3 |
| D | y最小=-3 |
- 提示1：
- DQpjPS005Luj5YWl5b6XYe+8nDDvvIxiPHN1cD4yPC9zdXA+PS00YQ==
- 提示2：
- IOS7o+WFpeacgOWAvOWFrOW8jzxpbWcgd2lkdGg9NDggaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNTMvckJBQ0ZGTU1VV0t3VWRRUEFBQUI3d1E3Vk0wNzQ4LnBuZyI+5b6X5Ye65pyA5YC8
正确答案：Qw==
PGRpdj7op6PvvJrmiop4PTDml7Z5PS005Luj5YWl5LqM5qyh5Ye95pWweT1heDxzdXA+Mjwvc3VwPitieCtj77yM5b6XYz0tNO+8jOS7o+WFpWI8c3VwPjI8L3N1cD49YWPlvpdiPHN1cD4yPC9zdXA+PS00Ye+8jDwvZGl2PjxkaXY+5pWFYe+8nDDvvIzmiYDku6XkuozmrKHlh73mlbDmnInmnIDlpKflgLzvvIzmiopjPS005Luj5YWl5pyA5aSn5YC85YWs5byP77yMPC9kaXY+PGRpdj48aW1nIHdpZHRoPTMyOCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMy80MS9yQkFDRTFNTVVXT0NlM1NfQUFBRkJ6alkxdFk2ODkucG5nIj48L2Rpdj4=
3/5单选题
难度：
3.
已知二次函数y=x2-2x+a，则下列说法中正确的是（ ）
| A | 当x＞1时，y随x的增大而减小 |
| B | 当a＞1时，该函数图象与x轴有两个交点 |
| C | 当x=1时，二次函数y=x2-2x+a的最小值是a-1 |
| D | 若将图象向上平移1个单位，再向右平移2个单位长度后过点（1，2），则a=2 |
- 提示1：
- PHA+5Yip55So5byA5Y+j5ZKM5a+556ew6L205L2N572u5a+75rGC56qB56C05Y+jPC9wPg==
正确答案：Qw==
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
4/5单选题
难度：
4.
若整数x，y满足条件2x2-6x+y2=0，则x2+y2-5x的最大值是( )
| A | 0 |
| B | 1 |
| C | 2 |
| D | 3 |
- 提示1：
- PHA+eDxzdXA+Mjwvc3VwPit5PHN1cD4yPC9zdXA+PS14PHN1cD4yPC9zdXA+KzZ4PC9wPg==
- 提示2：
- PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzU0L3JCQUNGRk1NVVhMVEU3LXJBQUFFUFdnR3dtZzQ2Mi5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNTQvckJBQ0ZGTU1VWExURTctckFBQUVQV2dHd21nNDYyLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjM5NyI+PC9wPg==
- 提示3：
- PHA+5b2T5pW05pWweD0x5oiWMOaXtu+8jHg8c3VwPjI8L3N1cD4reTxzdXA+Mjwvc3VwPi01eOWPluacgOWkp+WAvDA8L3A+
正确答案：QQ==
PGRpdj7op6PvvJrmlbTnkIblvpd4PHN1cD4yPC9zdXA+K3k8c3VwPjI8L3N1cD49LXg8c3VwPjI8L3N1cD4rNng8L2Rpdj48ZGl2PuS7pDxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMC81NC9yQkFDRkZNTVVYV0FwYl9GQUFBRWR6Y0QzdWsyNzgucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzU0L3JCQUNGRk1NVVhXQXBiX0ZBQUFFZHpjRDN1azI3OC5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSI0MjMiPjwvZGl2PjxkaXY+5b2T5pW05pWweD0x5oiWMOaXtu+8jHg8c3VwPjI8L3N1cD4reTxzdXA+Mjwvc3VwPi01eOWPluacgOWkp+WAvDA8L2Rpdj4=
5/5单选题
难度：
5.
二次函数y=x2+2ax+a在
上有最小值-4，则a的值为( )
| A |
|
| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+6K6o6K665bCG5a+556ew6L20PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzQxL3JCQUNFMU1NVVdtd1daRG9BQUFCVkJWak5VUTc5My5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNDEvckJBQ0UxTU1VV213V1pEb0FBQUJWQlZqTlVRNzkzLnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjQ4Ij7kuI48aW1nIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNDEvckJBQ0UxTU1VV2lpeW9sZ0FBQUJxQ1Nfa0tnNDQyLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMy80MS9yQkFDRTFNTVVXaWl5b2xnQUFBQnFDU19rS2c0NDIucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iNzkiPueahOS9jee9ruWFs+ezuzwvcD4=
正确答案：Qw==
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