勾股定理:APi^2 = AD^2 + PiD^2 = AD^2 + (BD-BPi)^2 = AD^2 + BD^2 - 2BD*BPi + BPi^2 = 1 + BPi(BPi-BC) = 1 - BPi*PiC
APi^2 + BPi*PiC = 1
m1 + m2 + ...+ m2013 = 2013
勾股定理:APi^2 = AD^2 + PiD^2 = AD^2 + (BD-BPi)^2 = AD^2 + BD^2 - 2BD*BPi + BPi^2 = 1 + BPi(BPi-BC) = 1 - BPi*PiC
APi^2 + BPi*PiC = 1
m1 + m2 + ...+ m2013 = 2013