配套习题-用待定系数法求二次函数解析式 -【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.已知二次函数的图象经过点（-1，-5），（0，-4）和（1，1），则这二次函数的表达式为（　　）

A: y=-6x²+3x+4

B: y=-2x²+3x-4

C: y=x²+2x-4

D: y=2x²+3x-4

提示1：5Yip55So5b6F5a6a57O75pWw5rOV5Y2z5Y+v5rGC5Ye65oqb54mp57q/55qE6Kej5p6Q5byP77yO
答案：RA==
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

本课配套习题挑战模式2/5

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单选题

难度系数：

2.顶点为（6，0），开口向下，开口的大小与函数y=

x²的图象相同的抛物线所对应的函数是（　　）

A:

B:

C:

D:

提示1：5qC55o2u6aKY5oSP77yM5Y+v5qC55o2u5LqM5qyh5Ye95pWw6Kej5p6Q5byP55qE4oCc6aG254K55byP4oCd5rGC6Kej77yb
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：

3.一个二次函数的图象的顶点坐标是（2，4），且过另一点（0，-4），则这个二次函数的解析式为（　　）

A: y=-2（x+2）²+4

B: y=-2（x-2）²+4

C: y=2（x+2）²-4

D: y=2（x-2）²-4

提示1：5qC55o2u5LqM5qyh5Ye95pWw55qE6aG254K55byP5rGC6Kej5p6Q5byP77yO
答案：Qg==
6Kej77ya4oi15LqM5qyh5Ye95pWw55qE5Zu+6LGh55qE6aG254K55Z2Q5qCH5piv77yIMu+8jDTvvInvvIw8YnI+4oi06K6+6L+Z5Liq5LqM5qyh5Ye95pWw55qE6Kej5p6Q5byP5Li6eT1h77yIeC0y77yJPHN1cD4yPC9zdXA+KzTvvIw8YnI+5oqK77yIMO+8jC3vvIw077yJ5Luj5YWl5b6XYT0tMu+8jDxicj7iiLTov5nkuKrkuozmrKHlh73mlbDnmoTop6PmnpDlvI/kuLp5PS0y77yIeC0y77yJPHN1cD4yPC9zdXA+KzTvvI48YnI+5pWF6YCJQu+8jg==

本课配套习题挑战模式4/5

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单选题

难度系数：

4.将二次函数y=x²-2x+3化为y=（x-h）²+k的形式，结果为（　　）

A: y=（x+1）²+4

B: y=（x+1）²+2

C: y=（x-1）²+4

D: y=（x-1）²+2

提示1：5qC55o2u6YWN5pa55rOV6L+b6KGM5pW055CG5Y2z5Y+v5b6X6Kej77yO
答案：RA==
6Kej77yaeT14PHN1cD4yPC9zdXA+LTJ4KzPvvIw8YnI+Pe+8iHg8c3VwPjI8L3N1cD4tMngrMe+8iSsy77yMPGJyPj3vvIh4LTHvvIk8c3VwPjI8L3N1cD4rMu+8jjxicj7mlYXpgInvvJpE77yO

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+4

B: y=-ax²-2ax-3（a＞0）

C: y=-2x²-4x-5

D: y=ax²-2ax+a-3（a＜0）

提示1：5YWI55Sx6aG254K55YWs5byPLOaxguWHuuaKm+eJqee6v3k9Mng8c3VwPjI8L3N1cD4tNHgtMeeahOmhtueCueWdkOagh+S4uu+8iDHvvIwtM++8iQ==
提示2：5qC55o2u6aKY5oSP5b6X5omA5rGC55qE5LqM5qyh5Ye95pWw55qE6Kej5p6Q5byP55qE6aG254K55Z2Q5qCH5piv77yIMe+8jC0z77yJ77yM5LiU5oqb54mp57q/5byA5Y+j5ZCR5LiL
提示3：5YaN5YiG5Yir56Gu5a6a6YCJ6aG55Lit55qE6aG254K55Z2Q5qCH5ZKM5byA5Y+j5pa55ZCR5Y2z5Y+v5rGC6Kej77yO
答案：RA==
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本课配套习题挑战模式3/5

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本课配套习题挑战模式5/5

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