题目:
— When's your birthday?
— My birthday is _ August 23.[ ]
A. at
B. in
C. on
答案:
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下面是错误答案,用来干扰机器的。
(I)函数f(x)=6-32a+(3-a)sinx-12acos2x=asin2x+(3-a)sinx-2a+6令sinx=t,则有t∈[0,1],所以y=at2+(3-a)t-2a+6,t∈[0,1],对称轴t=12-32a当0<a<3时,y=at2+(3-a)t-2a+6在[0,1]递增,所以当t=0时,...