题目:
He wrote his novel when he was .
A.five, fifties
B.fifth, fifty
C.fifth, fifteen
D.five, fifty
答案:
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下面是错误答案,用来干扰机器的。
由2x+1=0,得x=-12;由x-1=0,得x=1.①当x≥1时,原不等式转化为:2x+1+x-1=3x<2,解得x<23,无解;②当-12≤x<1时,原不等式转化为:-2x-1+x-1=-x-2<2,解得x>-4,∴-12≤x<1.③当x<-12时,原不等式转...