例如:Y=474.9661+1.6599x1-0.8915x12+7.0621x2-0.3547x22+16.2158x3-0.9935x32+0.6074x1x2+1.2556x1x3-1.0465x2x3
1.6599-2*0.8915x1+0.6074x2+1.2556x3=3.5/1.4
7.0621-2*0.3547x2+0.6074x1-1.0465x3=3.3/1.4
16.2158-2*0.9935x3+1.2556x1-1.0465x2=4.2/1.4
如何解
例如:Y=474.9661+1.6599x1-0.8915x12+7.0621x2-0.3547x22+16.2158x3-0.9935x32+0.6074x1x2+1.2556x1x3-1.0465x2x3
1.6599-2*0.8915x1+0.6074x2+1.2556x3=3.5/1.4
7.0621-2*0.3547x2+0.6074x1-1.0465x3=3.3/1.4
16.2158-2*0.9935x3+1.2556x1-1.0465x2=4.2/1.4
如何解