공식.r-1분의a(r의n승-1)=48.r-1분의a(r의2n승-1)=72.분모정리(r2n승-1)합차공식사용하면(r의n승-1)(r의n승+1)여기다첫번?식좌변대입해서r의n승구해공식에대입
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