解方程组,化简a1+a1*q^3=18,a1*q+a1*q^2=12(这是一个方程组,q^3,q^2分别指q的三次方.二次方)3^n-2-=2*3^(n-1)(2-根号2)(根号2-1)^(n-1)=根号2(根号2-1)^n+根号2以上两个是如何从左边推到右边的)
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![解方程组,化简a1+a1*q^3=18,a1*q+a1*q^2=12(这是一个方程组,q^3,q^2分别指q的三次方.二次方)3^n-2-=2*3^(n-1)(2-根号2)(根号2-1)^(n-1)=根号2(根号2-1)^n+根号2以上两个是如何从左边推到右边的)](/uploads/image/z/12558649-49-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%2C%E5%8C%96%E7%AE%80a1%2Ba1%2Aq%5E3%3D18%2Ca1%2Aq%2Ba1%2Aq%5E2%3D12%28%E8%BF%99%E6%98%AF%E4%B8%80%E4%B8%AA%E6%96%B9%E7%A8%8B%E7%BB%84%2Cq%5E3%2Cq%5E2%E5%88%86%E5%88%AB%E6%8C%87q%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%EF%BC%8E%E4%BA%8C%E6%AC%A1%E6%96%B9%EF%BC%893%5En-2-%3D2%2A3%5E%28n-1%29%282-%E6%A0%B9%E5%8F%B72%29%28%E6%A0%B9%E5%8F%B72-1%29%5E%28n-1%29%3D%E6%A0%B9%E5%8F%B72%28%E6%A0%B9%E5%8F%B72-1%29%5En%2B%E6%A0%B9%E5%8F%B72%E4%BB%A5%E4%B8%8A%E4%B8%A4%E4%B8%AA%E6%98%AF%E5%A6%82%E4%BD%95%E4%BB%8E%E5%B7%A6%E8%BE%B9%E6%8E%A8%E5%88%B0%E5%8F%B3%E8%BE%B9%E7%9A%84%EF%BC%89)
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