设全集U={2,4,a²-2a-1},集合A={a+6,2},CuA={7},求实数a的值
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![设全集U={2,4,a²-2a-1},集合A={a+6,2},CuA={7},求实数a的值](/uploads/image/z/1750486-22-6.jpg?t=%E8%AE%BE%E5%85%A8%E9%9B%86U%3D%7B2%2C4%2Ca%26%23178%3B-2a-1%7D%2C%E9%9B%86%E5%90%88A%3D%7Ba%2B6%2C2%7D%2CCuA%3D%7B7%7D%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%80%BC)
设全集U={2,4,a²-2a-1},集合A={a+6,2},CuA={7},求实数a的值
设全集U={2,4,a²-2a-1},集合A={a+6,2},CuA={7},求实数a的值
设全集U={2,4,a²-2a-1},集合A={a+6,2},CuA={7},求实数a的值
a^2-2a-1 = 7
a + 6 = 4
so a = -2