这道题怎么解,就是那个不等式怎么解?已知数列bn的前n项和Sn=[n(3n-9)]/2,若对任意正整数n,有【k乘以(3的n次方)】大于等于bn则实数k的取值范围 那个不等式怎么解
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![这道题怎么解,就是那个不等式怎么解?已知数列bn的前n项和Sn=[n(3n-9)]/2,若对任意正整数n,有【k乘以(3的n次方)】大于等于bn则实数k的取值范围 那个不等式怎么解](/uploads/image/z/7175691-27-1.jpg?t=%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E8%A7%A3%2C%E5%B0%B1%E6%98%AF%E9%82%A3%E4%B8%AA%E4%B8%8D%E7%AD%89%E5%BC%8F%E6%80%8E%E4%B9%88%E8%A7%A3%3F%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97bn%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%3D%5Bn%283n-9%29%5D%2F2%2C%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8F%E6%AD%A3%E6%95%B4%E6%95%B0n%2C%E6%9C%89%E3%80%90k%E4%B9%98%E4%BB%A5%EF%BC%883%E7%9A%84n%E6%AC%A1%E6%96%B9%EF%BC%89%E3%80%91%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8Ebn%E5%88%99%E5%AE%9E%E6%95%B0k%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4++%E9%82%A3%E4%B8%AA%E4%B8%8D%E7%AD%89%E5%BC%8F%E6%80%8E%E4%B9%88%E8%A7%A3)
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