第四冊 1-1等差級數--測驗2
基測會考題
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1.
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4. 數列a,b,c為等差數列,公差為3。若數列a+5,b+10,c+15也為等差數列,則公差為何?
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7. 若小舒從1~50的整數中挑選4個數,使其由小到大排序後形成一等差數列,且4個數中最小的是7,則下列哪一個數不可能出現在小舒挑選的數之中?
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