则f(x,x2,x3)=2M2-22+62 所作的非退化线性替换是 10Y101 1-10‖y2 10‖010‖z2, 110/101Y100(w1)(113 1-101010‖012 1-1‖w 00 001八001 001 x1=1+v2+33 即 §2标准形§2 标准形 所作的非退化线性替换是 即 1 1 2 3 2 1 2 3 3 3 x w w w3 x w w w x w  = + +   = − −  =  1 2 3 1 1 0 1 0 1 1 0 0 1 1 0 0 1 0 0 1 2 0 0 1 0 0 1 0 0 1 w w w      = −                1 2 3 1 1 3 1 1 1 0 0 1 w w w    = − −          1 1 1 2 2 2 3 3 3 1 1 0 1 1 0 1 0 1 1 1 0 1 1 0 0 1 0 0 0 1 0 0 1 0 0 1 x y z x y z x y z                  = − = −                            222 1 2 3 1 2 3 则 f x x x w w w ( , , ) 2 2 6 = − +