来自戴文义的问题
f(x1,x2,x3)=2x1x2+2x1x3+2x2x3怎么用配方法化为标准型?
f(x1,x2,x3)=2x1x2+2x1x3+2x2x3怎么用配方法化为标准型?
1回答
2020-07-31 02:44
f(x1,x2,x3)=2x1x2+2x1x3+2x2x3怎么用配方法化为标准型?
f(x1,x2,x3)=2x1x2+2x1x3+2x2x3怎么用配方法化为标准型?
f(x1,x2,x3)=2x1x2+2x1x3+2x2x3
=2(y1+y2)(y1-y2)+2(y1+y2)y3+2(y1-y2)y3
=2y1^2+4y1y3-2y2^2
=2(y1+y3)^2-2y2^2-2y3^2
=2z1^2-2z2^2-2z3^2