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2011年北京大学保送生考试有一道代数等式的证明问题,下面笔者从四个角度给出不同的解法,与同行切磋.试题已知圆x2+y2=1上三点A(x1,
2011 Peking University Health exam has a proof of algebraic equality problem, the following author gives a different solution from four perspectives, and peers learn .Experiment known circle x2 + y2 = 1 on the three point A (x1,