這不是數學題

注意！這不是國小數學
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一對情侶一起去買了一塊餅
                                                                              
男生吃了4/7塊餅
                                                                              
女生吃掉剩下的3/7塊餅
                                                                              
而且男生比女生多出了45元
                                                                              
請問這塊餅是多少錢?
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.答案:       45元 

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