设全集U=R ,集合A={x|x小于a},B={x|x的平方-3x+2小于0},且AU(CuB)=R,则实数a的取值范围是?要完整的步骤········谢谢!
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![设全集U=R ,集合A={x|x小于a},B={x|x的平方-3x+2小于0},且AU(CuB)=R,则实数a的取值范围是?要完整的步骤········谢谢!](/uploads/image/z/5465881-1-1.jpg?t=%E8%AE%BE%E5%85%A8%E9%9B%86U%3DR+%2C%E9%9B%86%E5%90%88A%3D%7Bx%7Cx%E5%B0%8F%E4%BA%8Ea%7D%2CB%3D%7Bx%7Cx%E7%9A%84%E5%B9%B3%E6%96%B9-3x%2B2%E5%B0%8F%E4%BA%8E0%7D%2C%E4%B8%94AU%EF%BC%88CuB%EF%BC%89%3DR%2C%E5%88%99%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F%E8%A6%81%E5%AE%8C%E6%95%B4%E7%9A%84%E6%AD%A5%E9%AA%A4%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E8%B0%A2%E8%B0%A2%21)
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设全集U=R ,集合A={x|x小于a},B={x|x的平方-3x+2小于0},且AU(CuB)=R,则实数a的取值范围是?要完整的步骤········谢谢!
设全集U=R ,集合A={x|x小于a},B={x|x的平方-3x+2小于0},且AU(CuB)=R,则实数a的取值范围是?
要完整的步骤········谢谢!
设全集U=R ,集合A={x|x小于a},B={x|x的平方-3x+2小于0},且AU(CuB)=R,则实数a的取值范围是?要完整的步骤········谢谢!
B={1<x<2},CuB={x≤1or x≥2},又因为AU(CuB)=R,所以A={1<x<2},即a>2
B={X|1
B:(X-1)(X-2)<0→1<x<2 其关于U的补集为:{x|x≤1or x≥2}
A与B的并集为R,则a要不小于2即a≥2