國中數學求解.................?
回答 (1)
2017-06-02 12:15 am
Sol
x^2+y^2－6x+16y+73=0
(x^2－6x+9)+(y^2+16y+64)=0
(x－3)^2+(y+8)^2=0
x－3=0，y+8=0
x=3，y=-8
3x－y
=9+8
=17
x^2+y^2－6x+16y+73=0
(x^2－6x+9)+(y^2+16y+64)=0
(x－3)^2+(y+8)^2=0
x－3=0，y+8=0
x=3，y=-8
3x－y
=9+8
=17
收錄日期: 2021-04-30 22:15:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170601134847AAsq8EQ