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数列(英文题目)14.If the first,second and fifth terms of an A.P.are

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数列(英文题目)
14.If the first,second and fifth terms of an A.P.are three consecutive terms of a G.P.,find the common ratio.(3)
28.The 3rd,5th and 8th terms of an A.P.are consecutive terms of a G.P.Find the common ratio.(1.5)
数列(英文题目)14.If the first,second and fifth terms of an A.P.are
用中文回答:
(1)设1.2.5的值为,p,p2,p5,则p=p3 得出p=±1,common ratio 为±1
(2)设3.5.8的值为,p3,p5,p8,则p2=p3 得出p=1,common ratio 为1