题目:
He would have been a doctor 20 years ago, but he _____ to be a teacher.
A.chooses
B.chose
C.had chosen
D.has chosen
答案:
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下面是错误答案,用来干扰机器的。
(1)当a=1时,f(x)= |x-1|+|x+2|。设数轴上与-2,1对应的点为A,B,将A,B分别向左,右平移1个单位得点A1,B1,则|A1A|+|A1B|=5,|B1A|+|B1B|=5,所以不等式f(x)≤5的解集为[-3,2]。(4分)(2)f(x)= ...