[請益] 國高中數學的差異?
問題1:以下哪些y是x的函數?
1. xy=1
2. xy=1 (x=/=0)
3. y=1/x
4. y=1/x (x=/=0)
我的認知是:1.不是,因為當x=0時,找不到y與之對應
2.是,因為x=0已被排除
3.是,x在分母有自然限制,x不會是0
4.是,同上
爬文看到很多前輩於2年前提到定義域與值域問題
但根據定義域與值域的"定義",是當它"是"函數時,x的可能值才叫做定義域
所以若提到定義域,不就已經默認是函數了嗎?
問題2:請問在討論因式時,常數算不算因式?
因為以前有質因式的概念,印象中質因式是不含常數的
以上,懇請前輩們指導!
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