∵此函數(shù)圖像過點(diǎn)(1,5)
∴將(1,5) 代入函數(shù)f(x)=x+m/x 得m = 4
∴函數(shù)f(x)=x+4/x
設(shè):2≤x1<x2
求:f(x1) - f(x2) = x1 - x2 +4/x1 -4/x2
=x1 - x2 + 4(x2-x1)/x1x2
=(x2-x1)[4/x1x2 -1]
x2-x1 >0
x1x2>4 ∴4/x1x2 -1 <0
∴ f(x1) - f(x2) =(x2-x1)[4/x1x2 -1] <0
∴f(x1) <f(x2)
∴函數(shù)f(x)在[2,+∞)上的單調(diào)性為單調(diào)遞增
已知函數(shù)f(x)=x+m/x,且此函數(shù)圖像過點(diǎn)(1,5)討論函數(shù)f(x)在[2,+∞)上的單調(diào)性?并證
已知函數(shù)f(x)=x+m/x,且此函數(shù)圖像過點(diǎn)(1,5)討論函數(shù)f(x)在[2,+∞)上的單調(diào)性?并證
并證明你的結(jié)論
并證明你的結(jié)論
其他人氣:666 ℃時間:2019-10-26 10:33:25
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