1-1等差數列ㄧ測驗2
綜合測驗2
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1.下列何者不是等差數列?
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2. 一等差數列38 , 34 , 30 ,……,則下列何者不正確?
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3.
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4. 已知等差數列a1 , a2 , a3, …… 的公差為d。若a1=5,an=37,d=4,則 n=?
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5.
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6. 在等差數列7 , -1 , -9 , …… 中,-153是第幾項?
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7. 若5 , a , 19 , b , c為一等差數列,則a+b-c=?
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8. 若6是2x和y的等差中項,且7是x-y和x+36的等差中項,則x+y=?
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9. 若在24與-8之間插入11個數,使其成為一等差數列,則所插入的第幾個數為0?
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10.
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11.
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12. 已知等差數列a1 , a2 , a3, …… 的首項a1為-3。若a5:a9=1:3,則a13是多少?
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13. 在7與117之間要放入19個數,使之成為等差數列,則最中間的數為多少?
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14. 有兩個等差數列318 , 315 , 312 , ……與6 , 11 , 16 , ……,若此兩數列的第k項相同,則k=?
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15.
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16.已知a、b的等差中項為-2,且a+3b=2,求b=?
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17. 若一等差數列的公差為3,且它的第7項與第3項互為相反數,則它的第21項是多少?
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18.
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19.
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20.求數11…...1 ( 共2000個1 ) 被7除的餘數為何?
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