xn=a1(q1)^(n-1)
yn=b1(q2)^(n-1)
設(shè)cn=xnyn
Cn=a1b1(q1q2)^(n-1)
C(n-1)=a1b1(q1q2)^(n-2)
Cn/C(n-1)=q1q2
已知[Xn],[Yn]是項(xiàng)數(shù)想同的等比數(shù)列,求證,[Xn*Yn]是等比數(shù)列
已知[Xn],[Yn]是項(xiàng)數(shù)想同的等比數(shù)列,求證,[Xn*Yn]是等比數(shù)列
數(shù)學(xué)人氣:726 ℃時(shí)間:2020-05-08 05:25:59
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