根據(jù)題意,即為:(kx^2)-6kx+k+8>=0恒成立.
即函數(shù)y=(kx^2)-6kx+k+8恒在x軸上方,且與x軸最多有一個交點(diǎn).
則Δ=(6k)^2-4*k*(k+8)0 解得,0
求詳解若函數(shù)y=根[(kx^2)-6kx+k+8]的定義域為R,求實數(shù)k的取值范圍
求詳解若函數(shù)y=根[(kx^2)-6kx+k+8]的定義域為R,求實數(shù)k的取值范圍
需詳解
需詳解
數(shù)學(xué)人氣:696 ℃時間:2019-09-17 12:25:17
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