用配方法化下列二次型为标准形: f(x1,x2,x3)=x12+2x22一5x32+2x1x2—2x1x3+2x2x3.

admin2017-08-31  24

问题 用配方法化下列二次型为标准形:
f(x1,x2,x3)=x12+2x22一5x32+2x1x2—2x1x3+2x2x3

选项

答案令[*],则f(x1,x2,x3)=XTAX,f(x1,x2,x3)=x12+2x22一5x32+2x1x2-2x1x3+2x2x3 =(x1+x2一x3)2+(x2+2x3)2-10x32, [*]

解析
转载请注明原文地址:https://jikaoti.com/ti/UOVRFFFM
0

最新回复(0)