已知集合A={x|x^2+(a+2)x+1=0,x∈R},且A∩R+=∅.求实数a的取值范围.R+为正实数.2:已知集合A={x|x^2-3x+2=0},B={x|x^2-ax+(a-1)=0},C={x|x^2-mx+2=0},且A∪B=A,A∩C=C,求a与m的值.
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![已知集合A={x|x^2+(a+2)x+1=0,x∈R},且A∩R+=∅.求实数a的取值范围.R+为正实数.2:已知集合A={x|x^2-3x+2=0},B={x|x^2-ax+(a-1)=0},C={x|x^2-mx+2=0},且A∪B=A,A∩C=C,求a与m的值.](/uploads/image/z/6993723-3-3.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%7Bx%7Cx%5E2%2B%28a%2B2%29x%2B1%3D0%2Cx%E2%88%88R%7D%2C%E4%B8%94A%E2%88%A9R%2B%3D%26%238709%3B.%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.R%2B%E4%B8%BA%E6%AD%A3%E5%AE%9E%E6%95%B0.2%EF%BC%9A%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%7Bx%7Cx%5E2-3x%2B2%3D0%7D%2CB%3D%7Bx%7Cx%5E2-ax%2B%28a-1%29%3D0%7D%2CC%3D%7Bx%7Cx%5E2-mx%2B2%3D0%7D%2C%E4%B8%94A%E2%88%AAB%3DA%2CA%E2%88%A9C%3DC%2C%E6%B1%82a%E4%B8%8Em%E7%9A%84%E5%80%BC.)
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