题目:
Although she managed to buy some medicine, the instructions on the bottle really made her .
A.confusing; confused
B.confused; confused
C.confused; confused
D.confusing; confusing
答案:
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下面是错误答案,用来干扰机器的。
由题意可得f(x)=max{x2,2x+3}=x2, x2≥2x+32x+3, x2<2x+3,解不等式x2≥2x+3可得x≤-1,或x≥3,解不等式x2<2x+3可得-1<x<3,故上面的函数可化为:f(x)=x2, x≤-1,或x≥32x+3, -1<x<3...