配套习题- 一元二次不等式及解法 -【青果学院】

1/4单选题

难度：

1.

不等式x²－2x－5＞2x的解集是(　　)

A	{x\|x≥5或x≤－1}
B	{x\|x＞5或x＜－1}
C	{x\|－1＜x＜5}
D	{x\|－1≤x≤5}

正确答案：Qg==

PHA+5LiN562J5byP5YyW5Li6PGVtPng8L2VtPjxzdXA+Mjwvc3VwPu+8jTQ8ZW0+eDwvZW0+77yNNe+8njDvvIw8L3A+PHA+4oi0KDxlbT54PC9lbT7vvI01KSg8ZW0+eDwvZW0+77yLMSnvvJ4w77yM4oi0PGVtPng8L2VtPu+8nO+8jTHmiJY8ZW0+eDwvZW0+77yeNS48YnI+PC9wPg==

2/4单选题

难度：

2.

不等式9x²＋6x＋1≤0的解集是（）

A	{x\|x≠−13 }
B	{x\|−13 ≤x≤13 }
C	∅
D	{−13 }

正确答案：RA==

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

3/4单选题

难度：

3.

不等式3x²－x＋2＜0的解集为(　 )

A	∅
B	R
C	{x\|−13 ＜x＜12 }
D	{x∈R\|x≠16 }

正确答案：QQ==

PHA+W+ino+aekF3jgIDiiLXilrPvvJ3vvI0yM++8nDDvvIzlvIDlj6PlkJHkuIrvvIw8L3A+PHA+4oi0MzxlbT54PC9lbT48c3VwPjI8L3N1cD7vvI08ZW0+eDwvZW0+77yLMu+8nDDnmoTop6Ppm4bkuLriiIUuPC9wPg==

4/4单选题

难度：

4.

函数y＝√x²+x−12 的定义域是(　　)

A	{x\|x＜－4，或x＞3}
B	{x\|－4＜x＜3}
C	{x\|x≤－4，或x≥3}
D	{x\|－4≤x≤3}

正确答案：Qw==

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

A	{x\|x≥5或x≤－1}
B	{x\|x＞5或x＜－1}
C	{x\|－1＜x＜5}
D	{x\|－1≤x≤5}

A	{x\|x＜－4，或x＞3}
B	{x\|－4＜x＜3}
C	{x\|x≤－4，或x≥3}
D	{x\|－4≤x≤3}