1-1 等差數列---2

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1-1 等差數列---2

等差數列

班級 *

座號 *

20 points

甲，乙

甲，丙

乙，丙

甲，乙，丙

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2. 若－3 , 0 , a , b成等差數列，則b－a＝？

20 points

－3

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3. 有一等差數列，公差為－4，若將此等差數列各項同乘以2，再加上5，則新數列的公差為多少？

20 points

－4

－8

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4. 有一等差數列－6 , －4 , －2 ,0 ,……，則公差＝？

20 points

－2

－4

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5.在－16和34之間插入9個數，使其成為等差數列，則此等差數列的公差為何？

20 points

－5

－4

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