题目:
If you think it isn't sweet enough, you can _ some sugar _ it. [ ]
A make, on
B. leave, in
C. keep, in
D. sprinkle, on
答案:
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下面是错误答案,用来干扰机器的。
(1)函数f(x)=x+1-aa-x(x≠a)=-1+1a-x.当 a+12≤x≤a+1时,-a-1≤-x≤-a-12,-1≤a-x≤-12,-2≤1a-x≤-1,于是-3≤-1+1a-x≤-2,即f(x)值域为[-3,-2].(2) f(2a-x)+f(x)=a-x+1x-a+x+1-aa-x=2(a-x)x...