配套习题-待定系数法确定二次函数解析式 -【青果学院】

本课配套习题挑战模式1/5

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单选题

难度系数：

1.如图，抛物线的函数表达式是（　　）

A: y=x²-x+2

B: y=x²+x+2

C: y=-x²-x+2

D: y=-x²+x+2

提示1：IOagueaNrumimOaEj++8jOaKiuaKm+eJqee6v+e7j+i/h+eahOS4ieeCueS7o+WFpeWHveaVsOeahOihqOi+vuW8j++8jOWIl+WHuuaWueeoi+e7hO+8jOino+WHuuWQhOezu+aVsOWImeWPry4=
答案：RA==
6Kej77ya5qC55o2u6aKY5oSP77yM6K6+5LqM5qyh5Ye95pWw55qE6KGo6L6+5byP5Li6eT1heDxzdXA+Mjwvc3VwPitieCtj77yMPGJyPuaKm+eJqee6v+i/h++8iC0x77yMMO+8ie+8jO+8iDDvvIwy77yJ77yM77yIMu+8jDDvvInvvIw8YnI+5omA5LulPGltZyB3aWR0aD0xMTUgaGVpZ2h0PTgzIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNDkvMkMvckJBQ0UxUEl3NG1Sc0JEVUFBQUR3QmlWMS1VMzQ3LnBuZyI+PGJyPuino+W+l2E9LTHvvIxiPTHvvIxjPTLvvIw8YnI+6L+Z5Liq5LqM5qyh5Ye95pWw55qE6KGo6L6+5byP5Li6eT0teDxzdXA+Mjwvc3VwPit4KzIuIDxicj7mlYXpgIlELiA=

本课配套习题挑战模式2/5

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单选题

难度系数：

2.已知二次函数的图象经过（1，0）、（2，0）和（0，2）三点，则该函数的解析式是（　　）

A: y=2x²+x+2

B: y=x²+3x+2

C: y=x²-2x+3

D: y=x²-3x+2

提示1：IOacrOmimOW3suefpeS6huaKm+eJqee6v+S4iuS4ieeCueeahOWdkOagh++8jOWPr+ebtOaOpeeUqOW+heWumuezu+aVsOazleaxguinoy4=
答案：RA==
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

本课配套习题挑战模式3/5

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单选题

难度系数：

3.如果抛物线y=x²-6x+c-2的顶点到x轴的距离是3，那么c的值等于（　　）

A: 8

B: 14

C: 8或14

D: -8或-14

提示1：IOagueaNrumimOaEj++8jOefpemhtueCueeahOe6teWdkOagh+aYrzPmiJYtM++8jOWIl+WHuuaWueeoi+axguWHuuino+WImeWPry4=
答案：Qw==
6Kej77ya5qC55o2u6aKY5oSPPGltZyB3aWR0aD02OSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC80OS8yQy9yQkFDRTFQSXc1Q1FrUUcwQUFBQ1NnTXpySVU3MzcucG5nIj49wrEzPGJyPuino+W+l2M9OOaIljE0LiA8YnI+5pWF6YCJQy4g

本课配套习题挑战模式4/5

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单选题

难度系数：

4.

如果抛物线y=-x²+bx+c经过A（0，-2），B（-1，1）两点，那么此抛物线经过（　　）

A:
第一、二、三、四象限

B:
第一、二、三象限

C:
第一、二、四象限

D:
第二、三、四象限

提示1：PHA+5Yip55So5b6F5a6a57O75pWw5rOV5rGC5b6X6K+l5oqb54mp57q/55qE6Kej5p6Q5byPPC9wPg==
提示2：PHA+54S25ZCO5qC55o2u6Kej5p6Q5byP5rGC5b6X6K+l5oqb54mp57q/5LiOeei9tOeahOS6pOeCueWdkOagh+OAgemhtueCueWdkOagh++8jOS7juiAjOaOqOefpeivpeaKm+eJqee6v+aJgOe7j+i/h+eahOixoemZkC48L3A+
答案：RA==
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

本课配套习题挑战模式5/5

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单选题

难度系数：

5.若所求的二次函数图象与抛物线y=2x²-4x-1有相同的顶点，并且在对称轴的左侧，y随x的增大而增大，在对称轴的右侧，y随x的增大而减小，则所求二次函数的解析式为（　　）

A: y=-x²+2x-5

B: y=ax²-2ax+a-3（a＞0）

C: y=-2x²-4x-5

D: y=ax²-2ax+a-3（a＜0）

提示1：IOWFiOeUsemhtueCueWFrOW8j++8jOaxguWHuuaKm+eJqee6v3k9Mng8c3VwPjI8L3N1cD4tNHgtMeeahOmhtueCueWdkOagh+S4uu+8iDHvvIwtM++8ie+8jA==
提示2：IOagueaNrumimOaEj+W+l+aJgOaxgueahOS6jOasoeWHveaVsOeahOino+aekOW8j+eahOmhtueCueWdkOagh+aYr++8iDHvvIwtM++8ie+8jOS4lOaKm+eJqee6v+W8gOWPo+WQkeS4iy4=
提示3：IOWGjeWIhuWIq+ehruWumumAiemhueS4reeahOmhtueCueWdkOagh+WSjOW8gOWPo+aWueWQkeWNs+WPr+axguinoy4=
答案：RA==
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