doublegauss_ch2(double(*f)(double),intn);Gauss-ChebyeshevII积分doublecomp_gauss_leg(double(*f)(double),doublea,doubleb)逐次减半Gauss-legender两点求积doublecomp_trep(double(*f)(double),doublea,doubleb)doubleromberg(double(*f)(double),doublea,doubleb)