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把等式a~n/b~n=c/d写成a/b·a/b…a/b=c/d即可知,它成立的一个充分条件是存在线段d_1,d_2,…,d_(n-1),使得 a/b=c/d_1=d_1/d_2=…=d_(n-1)/d。例1.过△ABC的顶点A作其外接圆的切
The equation a~n/b~n=c/d is written as a/b?a/b...a/b=c/d to know that a sufficient condition for its establishment is that there exists a line segment d_1, d_2, ..., d_ ( N-1) such that a/b=c/d_1=d_1/d_2=...=d_(n-1)/d. Example 1. A vertex A of △ABC is cut as its circumcircle