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1-1 等差數列---1---數列
數列---找出數列的規律、循環小數的規律、圖形間的規律性
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1. 已知一數列1 , 2 , 3 , 2 , 1 , 2 , 3 , □ , 1 , 2 , 3 , 2，依某種規律排列而成，求□的值為何？
20 points
4
3
2
1
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2. 如圖，用等長的吸管依次向右排出相連的正方形，如果要排出第10個圖形，總共需要幾根吸管？
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30
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33
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3.
20 points
選項 1
選項 2
選項 3
選項 4
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4. 已知一數列─2 , 6 , ─18 , 54 , a , b，依某種規律排列而成，求b－a的值為何？
20 points
－324
324
－648
648
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5.
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0
8
9
1
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