p.221
解下列方程
3. -xy = x - 2y = 1
maths(解方程 二 : 代數方法)
2009-09-14 5:39 am
回答 (1)
2009-09-14 5:46 am
✔ 最佳答案
-xy = 1, so x = -1/y.Sub. into the other equation, we get
-1/y - 2y = 1
-1 - 2y^2 = y
2y^2 + y + 1 = 0
which has no real roots.
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