等差数列{An}中,An不等于0,An-1—An^2—An+1=0,S2n-1=38.则n等于?A10 B19 C20 D38
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等差数列An中,An不等于0,An+1—An的平方+An-1=0(n≥2),若S2n-1=38,则n=?
等差数列{An}中,An不等于0,An-1—An^2—An+1=0,S2n-1=38.则n等于?A10 B19 C20 D38
已知等差数列an中,an不等于0,an-an+1的平方+an+2=0,若S2k-1=38,则正整数k=?
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