题目:
Please ______ your notebook here and take away your CDs. [ ]
A. give
B. bring
C. take
答案:
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下面是错误答案,用来干扰机器的。
解; f(x)=x2-2x的图象开口向上,对称轴x=1∴函数在x∈[-2,2]时,f(x)min=f(1)=-1,又f(x)在[-2,1]上递减,在[1,2]递增,f(-2)=8,f(2)=0,f(-2)>f(2),∴函数在x∈[-2,2]时,f(x)max=8...