牛顿法 本程序由Fortran 90语言编写，在Vistual Fortran 5下编译通过!!!本程序适用于求解形如f(x)=1/2*x Ax+bx+c二次函数的稳定点； -Newton's law of the procedure Fortran 90 language, Vistual in Fortran compiler 5 under through! ! ! The procedure will be applicable to solve the shape of f