问题 填空题

已知f(x)是R上的奇函数,且当x>0时,f(x)=x|x-2|,求当x<0时,f(x)=______.

答案

∵y=f(x)是R上的奇函数,

当x<0时,f(x)=-f(-x)=-(-x)|-x-2|=x|x+2|

故答案为x|x+2|.

写作题
上星期学校就周末补课问题在家长中作了一次调查。以下是家长的观点:多数家长赞同周末补课,部分家长却表示反对。请你根据下面表格中的提示作总结汇报,并表达你的观点。
要求:(1)可以适当增加细节,要求意思连贯,语句通顺。
   (2)词数80字以上,开头已给,不计入总词数。
Most parents
A few parents
get more knowledge
too tired, too much pressure
have better grades
can’t have a good rest
not play computer games or watch TV
no time to do what they like to do
Last week, we did a survey of what parents think of extra classes on weekends. Here are the results.            
                                                                                        
                                                                                        
                                                                                        
                                                                                       
                                                                                            
                                                                                            
                                                                                            
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