用配方法化下列二次型成規(guī)范形,并寫出所用變換的矩降: f(x1,x2,x3)=x12+2x32+2x1x3+2x2x3
用配方法化下列二次型成規(guī)范形,并寫出所用變換的矩降: f(x1,x2,x3)=x12+3x22+5x32+2x1x2-4x1x3