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题型:综合题 题类:常考题 难易度:普通

分数的加法和减法(复习)7415 10

直接写出得数                                                                                                                                                                                                             
(1)、                                                                                                                                                                                           
(2)、                                                                                                                                                                                     
(3)、                                                                                                                                                                                     
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