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等比則a1a6=a3a4=32/9 a1+a6=11 所以a1,a6是方程x²;-11x+32/9=0的根 a1=32/3,a6=1/3或a1=1/3,a6=32/3 q^5=a6/a1=1/32或32 q=1/2或2 所以an=32/3*(1/2)^(n-1)或an=1/3*2^(n-1)
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