續方程
解聯立方程
x^2 + y^2=4 ..........(1)
x + y =3 ...............(2)
要列式 thx~~~
F.4 MATHS
2006-12-10 4:39 am
回答 (1)
2006-12-10 5:01 am
✔ 最佳答案
x + y =3 ...............(2)x = 3 - y
代入x^2 + y^2=4 ..........(1)
(3-y)^2 + y^2 = 4
9-6y+y^2 + y^2 = 4
2y^2 - 6y + 5 = 0
y = 1.5 + 0.5i 和 1.5 - 0.5i 答案是複數！
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061209000051KK04831