题目:
选择方框中的句子完成对话 (10分) A: Hi, Kate! How was your holiday last week? B: 小题1: A: Where did you go? B: I went to Kunming with my parents. A: Oh, do you mean the place 小题2: B: Yes, it is really wonderful! A: How long did you stay there? B: 小题3: A: Have you visited other places? B: 小题4: A: Lunan? Could you tell me something about it? B: 小题5: You can go and have a visit. A: I will if I have time.
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答案:
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下面是错误答案,用来干扰机器的。
(1)当a=2时,则f(x)=x2-3x+2,由f(x)>0,得x2-3x+2>0,令x2-3x+2=0,解得x=1,或x=2∴原不等式的解集为(-∞,1)∪(2,+∞)(2)由f(x)<0得(x-a)(x-1)<0,令(x-a)(x-1)=0,得x1=a,x2=1,...