>>240
π^3 = √(31^2 + 12/31 + 2/31^2)
　= 31 + 6/31^2 + 1/31^3 - 18/31^5 + ････
　= 31 + 187/31^3,
π = (31 + 187/31^3)^(1/3) = 3.14159267

>>409
e^π - π + 9/10000 = 19.99999997919