解答

✨ 最佳解答 ✨

加油!

22.
x^2 + y^2 -6y +9 =0
x^2 +(y-3)^2 =0
=> x = 0、y = 3

2x+y = 3

23.
x^2 -(4y^2 -12y +9)
= x^2 - (2y-3)^2
= (x+2y-3)(x-2y+3)

(x+2y-3) + (x-2y+3) = 6
2x = 6
x = 3

留言
您的問題解決了嗎?