设﹛An﹜是等比数列,Sn是它的前n项和,前2n项和与前3n项和分别为XYZ,z则下列等式中成立的是 A X+Z=2YB Y(Y-X)=Z(Z-X) C Y^2=XZ D Y(Y-X)=X(Z-X)
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![设﹛An﹜是等比数列,Sn是它的前n项和,前2n项和与前3n项和分别为XYZ,z则下列等式中成立的是 A X+Z=2YB Y(Y-X)=Z(Z-X) C Y^2=XZ D Y(Y-X)=X(Z-X)](/uploads/image/z/5154431-23-1.jpg?t=%E8%AE%BE%EF%B9%9BAn%EF%B9%9C%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2CSn%E6%98%AF%E5%AE%83%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E5%89%8D2n%E9%A1%B9%E5%92%8C%E4%B8%8E%E5%89%8D3n%E9%A1%B9%E5%92%8C%E5%88%86%E5%88%AB%E4%B8%BAXYZ%2Cz%E5%88%99%E4%B8%8B%E5%88%97%E7%AD%89%E5%BC%8F%E4%B8%AD%E6%88%90%E7%AB%8B%E7%9A%84%E6%98%AF+A+X%2BZ%3D2YB+Y%28Y-X%29%3DZ%28Z-X%29+C+Y%5E2%3DXZ+D+Y%28Y-X%29%3DX%28Z-X%29)
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