当公比q=1时,S=na1,T=a1^n,p=n/a1
(S/P)^n=(na1/(n/a1))^n=(a1^2)^n=a1^(2n)=(a1^n)^2=T^2.
当公比q≠1时,
an=a1q^(n-1)(n 为自然数)
S=a1(1-q^n)/(1-q)
T=a1*a2*...*an=a1*(a1q)*(a1q^2)*.*(a1q^(n-1))
当公比q=1时,S=na1,T=a1^n,p=n/a1
(S/P)^n=(na1/(n/a1))^n=(a1^2)^n=a1^(2n)=(a1^n)^2=T^2.
当公比q≠1时,
an=a1q^(n-1)(n 为自然数)
S=a1(1-q^n)/(1-q)
T=a1*a2*...*an=a1*(a1q)*(a1q^2)*.*(a1q^(n-1))