题目内容


计算:|﹣2|+2=      .                                                                


 4 .                                                                                             

【考点】有理数的加法;绝对值.                                                           

【分析】先计算|﹣2|,再加上2即可.                                                    

【解答】解:原式=2+2                                                                            

=4.                                                                                                  

故答案为4.                                                                                      

【点评】本题考查了有理数的加法,以及绝对值的求法,负数的绝对值等于它的相反数.   

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某蔬菜经销商去蔬菜生产基地批发某种蔬菜,已知这种蔬菜的批发量在20千克~60千克之间(含20千克和60千克)时,每千克批发价是5元;若超过60千克时,批发的这种蔬菜全部打八折,但批发总金额不得少于300元.                

(1)根据题意,填写如表:                                                                   

蔬菜的批发量(千克)            …                 25                 60                 75                 90 …

所付的金额(元)                   …                 125                                         300                   …

(2)经调查,该蔬菜经销商销售该种蔬菜的日销售量y(千克)与零售价x(元/千克)是一次函数关系,其图象如图,求出y与x之间的函数关系式;                                                                  

(3)若该蔬菜经销商每日销售此种蔬菜不低于75千克,且当日零售价不变,那么零售价定为多少时,该经销商销售此种蔬菜的当日利润最大?最大利润为多少元?                                                

                                                             

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