在等比数列{an}中,a5=4,a7=6,求an,Sn
人气:471 ℃ 时间:2020-06-02 22:23:28
解答
a5=4,a7=6,a5=a1*q^4=4a7=a1*q^6=6 q^2=3/21.q=根号6/2 2.q=-根号6/2a1=9...
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