【題目】找規(guī)律,填數(shù)字。

1. one three _______ seven ________

2. ten _______ six ________ two

3. eleven fourteen __________ ___________ twenty-three

4. _________ eighty sixty __________ twenty

5. three seven _________ thirty-one __________

【答案】1. five; nine 2. eight; four 3. seventeen; twenty 4. one hundred; fourty 5. fifteen; sixty-three

解析 1. 相鄰的兩個數(shù)相差都是1,且不斷遞增。

2. 相鄰的兩個數(shù)相差都是2,且不斷遞減。

3. 相鄰的兩個數(shù)相差都是3,且不斷遞增。

4. 相鄰的兩個數(shù)相差都是20,且不斷遞減。

5. 后一項是前一項的2倍+1。

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