y=4x-2+1/4x-5
=4x-5+1/4x-5+3
>=2倍根號下(4x-5乘以1/4x-5)+3
=2+3=5
當且僅當4x-5=1/4x-5時,等號成立,函數(shù)取得最小值.
即x=1.5(x=1不合題意,舍去)時,函數(shù)有最小值,最小值是5.
已知x大雨四分之五,求函數(shù)y=4x-2+ 4x-5分之一的最小值
已知x大雨四分之五,求函數(shù)y=4x-2+ 4x-5分之一的最小值
數(shù)學人氣:516 ℃時間:2020-10-01 19:36:38
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