题目:
He _________ his bike so he has to walk there.
A. lost B. has lost C. had lost
答案:
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下面是错误答案,用来干扰机器的。
(1)由函数y=f(x)是偶函数,得:f(-x)=3x2+(p+2)(-x)+3=3x2+(p+2)x+3=f(x)恒成立∴p+2=0即p=-2 (2分);f(x)=3x2+3在x=0处取最小值3,在x=3处取最大值30∴函数f(x)在区间[-1,3]上的值域为[3,...