∵y=x+4/x
∴此函數(shù)的定義域是(-∞,0)∪(0,+∞)
∵y'=1-4/x²=(x²-4)/x²
令y'=0,得x=±2
當(dāng)x∈(-∞,-2]∪[2,+∞)時,y'>0,則y單調(diào)遞增
當(dāng)x∈[-2,0)∪(0,2時,y'
求函數(shù)F(X)=X+4/X在區(qū)間【1,8】上的值域
求函數(shù)F(X)=X+4/X在區(qū)間【1,8】上的值域
數(shù)學(xué)人氣:124 ℃時間:2020-05-10 19:49:47
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