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三年级数学下册八数学广角_搭配第1课时简单的排列习题课件新人教版.ppt

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个,80,89,84,8,0,4,98,90,94,8,0,9,48,40,49,十,9,十,个,答:有种分法.,答:个,分别是,.,答:有种不同的排法.,答:要准备 种火车票才能满足不同的乘客.,

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