T5=a1*a2*a3*a4*a5由于a1*a5＝a2*a4＝a3的平方故T5＝a3的5次方＝32＝2的5次方a3＝2
B因为等积性,所以a1*a2*a3*a4*a5=(a3)^5=32所以a3=2
T5=a1*a2*a3*a4*a5=a1*a1q*a1q^2*a1q^3*a1q^4=(a1q^2)^5=32=2^5a1q^2=a3=2
