爱上海后花园

(1/2)已知数列an满足条件:a1=1.a2=r.(r>0)且{anan+1}是公比为q的等比数列,设bn=a2n-1+a2n,求数列bn的前

anan1an1an=qan1an1=qan2an=qa2k1=a2k1q;a2k=a2k2qa1=1a2=rbn=q^n1rq^n1bn=r1q^n1bn=r1q^0q^1q^2q^n1=r11q^n1q...

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