配套习题- 利用二次函数图像求一元二次方程的系数中字母的取值范围 -【青果学院】

1/5单选题

难度：

1.若函数y=mx²+（m+2）x+

m+1的图象与x轴只有一个交点，那么m的值为（　　）

A	0
B	0或2
C	2或-2
D	0、2或-2

正确答案：RA==

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2/5单选题

难度：

2.如图，已知二次函数y=-x²+2x，当-1＜x＜a时，y随x的增大而增大，则实数a的取值范围是（　　）

A	a＞1
B	-1＜a≤1
C	a＞0
D	-1＜a＜2

正确答案：Qg==

6Kej77ya5LqM5qyh5Ye95pWweT0teDxzdXA+Mjwvc3VwPisyeOeahOWvueensOi9tOS4uuebtOe6v3g9Me+8jDxicj7iiLUtMe+8nHjvvJxh5pe277yMeemaj3jnmoTlop7lpKfogIzlop7lpKfvvIw8YnI+4oi0YeKJpDHvvIw8YnI+4oi0LTHvvJxh4omkMS4gPGJyPuaVhemAiUIuIA==

3/5单选题

难度：

3.二次函数y=x²+bx的图象如图，对称轴为直线x=1，若关于x的一元二次方程x²+bx-t=0（t为实数）在-1＜x＜4的范围内有解，则t的取值范围是（　　）

A	t≥-1
B	-1≤t＜3
C	-1＜t＜8
D	3＜t＜8

正确答案：Qw==

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

4/5单选题

难度：

4.如图，抛物线y=ax²+bx+c与x轴交于点A（-1，0），顶点坐标为C（1，k），与y轴的交点在（0，2）、（0，3）之间（不包含端点），则k的取值范围是（　　）

A	2＜k＜3
B	＜k＜4
C	＜k＜4
D	3＜k＜4

正确答案：Qw==

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

5/5单选题

难度：

5.如图，二次函数y=ax²+bx+c的图象经过点（0，-2），与x轴交点的横坐标分别为x₁，x₂，且-1＜x₁＜0，1＜x₂＜2，下列结论正确的是（　　）

A	a＜0
B	a-b+c＜0
C	＞1
D	4ac-b²＜-8a

正确答案：RA==

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