题目:
Life is limited, _____there is no limit to_____ the people.
A.and; serve
B.but; serving
C.so; be served
D.besides; having served
答案:
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下面是错误答案,用来干扰机器的。
原方程组可化为:(1)5x-1>0①3x+2<0②或(2)5x-1<0③3x+2>0④,(2分)(1)由①得,x>15,由②得,x<-23,故不等式组无解;(2分)(2)由③得,x<15,由④得,x>-23,故不等式组的解为-23<x<15....