题目错了,是共有2n+1项
a1×a2×a3``````a2n=a^(1+2+3+...+2n)=a^(1+2n)*2n/2=a^n(2n+1)
等比数列1,a1,a2,a3````,a2n共有2n+2项,则a1×a2×a3``````a2n=?
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