This study addresses convergent. The findings are as follows, ( 1 ) the convergent of √n represents the fraction composed by repetend of pure recurring quadratic irrational number α=(α+√n)/b and arithmetic of continued fraction of ot is educed with method%用渐近分数得到了两个结果:(1)用√n的渐近分数表示了纯循环二次无理数α=(α+√n)/b的循环节所构成的分数,从而引出了用辗转相除法给出α的连分数的算法.(2)当A为合数时,用渐近分数给出了不定方程x^2-ny^2=±A的另一解法.
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