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2D數學
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每50個一數:400,450,________,________,________
500,550,600
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Okay!
每25個一數:275,300,________,________,________
325,350,375
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Okay!
每25個一數:125,150,________,________,________
175,200,225
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Okay!
以下哪一個不是每25個一數的數? A. 75 B. 135 C. 150 D. 250
B
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每20個一數:660,680,________,________,________
700,720,740
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Okay!
每20個一數:520,540,________,________,________
560,580,600
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Okay!
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