1.若关于x的方程x-x+m=0和x-x+n=0(m,n∈R且m≠n)的四个根组成首项为的等差数列,求m+n的值2.在等差数列2,5,8,…,(3n-1)中,每相邻两项间插入3个数,构成的新数列也是等差数列,问:(1)原数列的第12
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![1.若关于x的方程x-x+m=0和x-x+n=0(m,n∈R且m≠n)的四个根组成首项为的等差数列,求m+n的值2.在等差数列2,5,8,…,(3n-1)中,每相邻两项间插入3个数,构成的新数列也是等差数列,问:(1)原数列的第12](/uploads/image/z/2543247-63-7.jpg?t=1.%E8%8B%A5%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx-x%2Bm%3D0%E5%92%8Cx-x%2Bn%3D0%EF%BC%88m%2Cn%E2%88%88R%E4%B8%94m%E2%89%A0n%29%E7%9A%84%E5%9B%9B%E4%B8%AA%E6%A0%B9%E7%BB%84%E6%88%90%E9%A6%96%E9%A1%B9%E4%B8%BA%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82m%2Bn%E7%9A%84%E5%80%BC2.%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%972%2C5%2C8%2C%E2%80%A6%2C%EF%BC%883n-1%29%E4%B8%AD%2C%E6%AF%8F%E7%9B%B8%E9%82%BB%E4%B8%A4%E9%A1%B9%E9%97%B4%E6%8F%92%E5%85%A53%E4%B8%AA%E6%95%B0%2C%E6%9E%84%E6%88%90%E7%9A%84%E6%96%B0%E6%95%B0%E5%88%97%E4%B9%9F%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E9%97%AE%EF%BC%9A%EF%BC%881%EF%BC%89%E5%8E%9F%E6%95%B0%E5%88%97%E7%9A%84%E7%AC%AC12)
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