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四年级奥数：找规律，循环排列题目的解题方法
找规律：有250支笔，按照5支红笔、9支黄笔、13支绿笔的顺序循环排列，最后一支彩笔是什么颜色？这250支彩笔中，红笔有多少支？
四年级奥数：找规律9/20
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App02:21打开App观看
