f()+元,(x 2 x ax 3 )f(0) 2 +o孓 x 2 x 3 )2f(0) 2 f(O)+∑xf(0)+∑x f(0)+ O.OX =f(0)+(.V)f(0)+(x.V)2f(0)+ 2 (3)将在元=0点展开 f(x-x),x=0, r x-x R f(x-x=f(r)+(x'V)f(r)+-(x'v)f()+ ⑨回恩1 2 3 1 2 3 2 1 2 3 1 2 3 1 (0) ( ) (0) 1! 1 ( ) (0) 2 ! f x x x f x x x x x x f x x x  = + + +     + + + +       = +  + ( ) (0) + 2 1 (0) ( ) (0) 2 f x f x f (3) 将 r 1 x  = 0  在 点展开 1 1 1 1 f x x x ( ), 0, r x x r R = = − = =   −          −  = +  + ( ) ( ) + 2 1 ( ) ( ) ( ) ( ) 2 f x x f x x f x x f x 机动 目录 上页 下页 返回 结束 3 2 1 1 (0) (0) (0) 2 i i j i ij i i j f x f x x f x x x =   = + + +     