已知集合A={x|ax2-3x+2=0}至多有一个元素，则a的取值范围是____

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问题填空题

已知集合A={x|ax²-3x+2=0}至多有一个元素，则a的取值范围是______．

答案

a=0时，ax²-3x+2=0即x=

，A={

}，符合要求；

a≠0时，ax²-3x+2=0至多有一个解，△=9-8a≤0，a≥

综上，a的取值范围为a≥

或a=0

故答案为：a≥

或a=0

填空题

在下列各句的空白处填入一个最恰当的单词

1. He becomes sad easily. Let's __________ him up.

2. I often help mum __________ the dishes on the table before meals.

3. If you are good at playing soccer, you can help __________ a soccer team for kids.

4. There are many traffic __________ along the street. They can help you find the museum.

5. He likes animals very much. He wants to be a __________ in the future.

多项选择题

依据《生产安全事故应急处置评估暂行办法》，生产安全事故应急处置评估应当按照（）的原则进行。

A.公开

B.公正

C.客观

D.科学