若一等差數列的首項為-5,公差為7,則這個等差數列的第15項為__________.

1月3日高二愛複習

Quiz
•
Mathematics
•
11th Grade
•
Easy
hiofan Wong
Used 2+ times
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10 questions
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1.
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2 mins • 1 pt
2.
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等差數列12, 16, 20, …, 72,共有____項。
3.
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2 mins • 1 pt
求和1+3+5+7+9+…+99=_______________.
4.
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2 mins • 1 pt
6和20的等差中項為________________
5.
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2 mins • 1 pt
在等差數列80, 76, 72, 68, …中有_________個正數的項。
6.
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1 min • 1 pt
等比數列:2, 4, 8,…,則第6項為__________.
7.
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2 mins • 1 pt
在等比數列 5, 15, 45,……405 中共有____________項.
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