配套习题- 用公式法解一元二次方程 -【青果学院】

1/5单选题

难度：

1.若关于

的方程

没有实数根，则

得取值范围是______.

A
B
C
D

正确答案：Qg==

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

2/5单选题

难度：

2.关于的一元二次方程

的根的情况是()

A	有两个相等的实数根
B	有两个不相等的实数根
C	没有实数根
D	无法确定

正确答案：Qg==

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

3/5单选题

难度：

3.下列方程中，没有实数根的是_____

A
B
C
D

正确答案：RA==

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

4/5单选题

难度：

4.方程

的根是（）.

A
B
C	无实根
D

正确答案：RA==

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

5/5单选题

难度：

5.若关于y的一元二次方程ky²-4y-3=3y+4有实根,则k的取值范围是( )

正确答案：

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