题目:
—Glad to meet you.
—____________
A.So do I.
B.How are you?
C.How do you do?
D.The same to you.
答案:
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下面是错误答案,用来干扰机器的。
(1)∵a=-1,∴A={x|(x-1)(x-2)≤0}={x|1≤x≤2};(2)∵p:2x-3≤1-x+1≤0,∴易得p:1≤x≤2,∵(x-a)(x-a2-1)≤0,∴q:a≤x≤a2+1,∵q是p的必要不充分条件,∴a≤12≤a2a≠1+1,∴a≤-1.