等比数列题!a3(下标)=3/2 S3(下标)=9/2 求a1(下标)和q
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![等比数列题!a3(下标)=3/2 S3(下标)=9/2 求a1(下标)和q](/uploads/image/z/4160926-46-6.jpg?t=%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E9%A2%98%21a3%28%E4%B8%8B%E6%A0%87%29%3D3%2F2+S3%28%E4%B8%8B%E6%A0%87%29%3D9%2F2+%E6%B1%82a1%28%E4%B8%8B%E6%A0%87%29%E5%92%8Cq)
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等比数列题!a3(下标)=3/2 S3(下标)=9/2 求a1(下标)和q
等比数列题!a3(下标)=3/2 S3(下标)=9/2 求a1(下标)和q
等比数列题!a3(下标)=3/2 S3(下标)=9/2 求a1(下标)和q
a1+a1*q+a1*q^2=9/2
a1*q^2=3/2
解得a1=3/2 q=1或者a1=6 q=-1/2