已知x+y+z=6,1/(x-1)+1/(y-2)+1/(z-3)=0,求(x-1)^2+(y-2)^2+(z-3)^2的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 10:14:28
已知x+y+z=6,1/(x-1)+1/(y-2)+1/(z-3)=0,求(x-1)^2+(y-2)^2+(z-3)^2的值
xQN@OM5bO! pjPDD&&&\ A(?n [ \ueg+hEDtP )SհS\KCpTɒXE)kE 6;5v'f2c/*$gw3A"L8G[C59$ CQ|lP$w  ,eSI5tBѓr@, $yC)~TcY2+!*Lפ1ڔG$(o9J8l$&bK9B&p`ǮN+ ~u-H"u,֙d$8Ӏ~y+|-:km tH

已知x+y+z=6,1/(x-1)+1/(y-2)+1/(z-3)=0,求(x-1)^2+(y-2)^2+(z-3)^2的值
已知x+y+z=6,1/(x-1)+1/(y-2)+1/(z-3)=0,求(x-1)^2+(y-2)^2+(z-3)^2的值

已知x+y+z=6,1/(x-1)+1/(y-2)+1/(z-3)=0,求(x-1)^2+(y-2)^2+(z-3)^2的值
为了方便输入,设x-1=a,y-2=b,z-3=c
由x+y+z=6,得a+b+c=0
由1/a+1/b+1/c=0得bc+ac+ab=0
(a+b+c)^2=a^2+b^2+c^2+2(bc+ac+ab)
可得所求值为(x-1)^2+(y-2)^2+(z-3)^2=a^2+b^2+c^2=0.

x+y+z=6,得到(x-1)+(y-2)+(z-3)=0,且1/(x-1)+1/(y-2)+1/(z-3)=0,等介于a+b+c=0且1/a+1/b+1/c=0,由第二个去分母得到:ab+bc+ca=0,第一个平方后再减去第二个的2倍,得:a²+b²+c²=0。
题目好像有问题啊。。