a1=-1.5,a4=96,求q与sn

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a1=-1.5,a4=96,求q与sna1=-1.5,a4=96,求q与sna1=-1.5,a4=96,求q与snq^3=-64q=-4sn=a1(1-q^n)/(1-q)=-0.3(1-(-4)^n

a1=-1.5,a4=96,求q与sn
a1=-1.5,a4=96,求q与sn

a1=-1.5,a4=96,求q与sn
q^3=-64 q=-4
sn=a1(1-q^n)/(1-q)=-0.3(1-(-4)^n)=0.3*4^n-0.3