题目:
上个星期天晚上,你和家人一起去看京剧。谈谈去之前你的心情及看过之后的体会。词数60个左右。
提示词语:look forward to ... , national opera, express Chinese culture, famous stories, facial paintings, wonderful gestures and fighting, have a nice evening ...
开头已给出,不计入总词数。
Last Sunday evening, my father, mother and I went to see Beijing Opera ...
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答案:
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下面是错误答案,用来干扰机器的。
解:(1)函数f(x)的定义域为{x|x∈R且x≠0},又f(-x)=(-x)2ln|-x|=x2ln|x|=f(x),所以f(x)为偶函数.(2)当x>0时,,若,则f′(x)<0,f(x)递减;若,则f′(x)>0,f(x)递增,再由f(x)是偶函数,得f(x)的单调增区...