设集合A={x/x^2 +(m+2)x+1=0,x∈R},B=(0,+∞),且A∩B=空集,则实数m的取值范围是A.[0,+∞]B.(0,+∞)C.(-4,0)D.(-4,+∞)
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![设集合A={x/x^2 +(m+2)x+1=0,x∈R},B=(0,+∞),且A∩B=空集,则实数m的取值范围是A.[0,+∞]B.(0,+∞)C.(-4,0)D.(-4,+∞)](/uploads/image/z/5485812-60-2.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%EF%BD%9Bx%2Fx%5E2+%2B%EF%BC%88m%2B2%EF%BC%89x%2B1%3D0%2Cx%E2%88%88R%EF%BD%9D%2CB%3D%EF%BC%880%2C%EF%BC%8B%E2%88%9E%EF%BC%89%2C%E4%B8%94A%E2%88%A9B%3D%E7%A9%BA%E9%9B%86%2C%E5%88%99%E5%AE%9E%E6%95%B0m%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AFA.%5B0%2C%2B%E2%88%9E%5DB.%280%2C%2B%E2%88%9E%29C.%28-4%2C0%29D.%28-4%2C%2B%E2%88%9E%29)
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设集合A={x/x^2 +(m+2)x+1=0,x∈R},B=(0,+∞),且A∩B=空集,则实数m的取值范围是A.[0,+∞]B.(0,+∞)C.(-4,0)D.(-4,+∞)
设集合A={x/x^2 +(m+2)x+1=0,x∈R},B=(0,+∞),且A∩B=空集,则实数m的取值范围是
A.[0,+∞]
B.(0,+∞)
C.(-4,0)
D.(-4,+∞)
设集合A={x/x^2 +(m+2)x+1=0,x∈R},B=(0,+∞),且A∩B=空集,则实数m的取值范围是A.[0,+∞]B.(0,+∞)C.(-4,0)D.(-4,+∞)
集合A={x^2+(m+2)x+1=0,x∈R},B=(0,+∞)
由A∩B=空集
则方程x^2+(m+2)x+1=0的两根小于等于0
或方程x^2+(m+2)x+1=0无解
当方程x^2+(m+2)x+1=0无解
Δ=(m+2)^2-4