设全集U={2,3,5},A={|a-5|},cuA={5},则a的值是?上面打错了设全集U={2,3,5},A={|a-5|,2},cuA={5},则a的值是?
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![设全集U={2,3,5},A={|a-5|},cuA={5},则a的值是?上面打错了设全集U={2,3,5},A={|a-5|,2},cuA={5},则a的值是?](/uploads/image/z/5495428-28-8.jpg?t=%E8%AE%BE%E5%85%A8%E9%9B%86U%3D%7B2%2C3%2C5%7D%2CA%3D%7B%7Ca-5%7C%7D%2CcuA%3D%7B5%7D%2C%E5%88%99a%E7%9A%84%E5%80%BC%E6%98%AF%3F%E4%B8%8A%E9%9D%A2%E6%89%93%E9%94%99%E4%BA%86%E8%AE%BE%E5%85%A8%E9%9B%86U%3D%7B2%2C3%2C5%7D%2CA%3D%7B%7Ca-5%7C%2C2%7D%2CcuA%3D%7B5%7D%2C%E5%88%99a%E7%9A%84%E5%80%BC%E6%98%AF%3F)
设全集U={2,3,5},A={|a-5|},cuA={5},则a的值是?上面打错了设全集U={2,3,5},A={|a-5|,2},cuA={5},则a的值是?
设全集U={2,3,5},A={|a-5|},cuA={5},则a的值是?
上面打错了
设全集U={2,3,5},A={|a-5|,2},cuA={5},则a的值是?
设全集U={2,3,5},A={|a-5|},cuA={5},则a的值是?上面打错了设全集U={2,3,5},A={|a-5|,2},cuA={5},则a的值是?
∵A∈U又∵CuA={5},
∴A={2,3}
由题可得A={|a-5|,2},
∴|a-5|=3
去绝对值,则
(1)a-5=3即a=3+5=8.
(2)-a+5=3即-a=-2,a=2.
我是高一学生,哈哈,内好~
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