{a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数?为什么有8个而不是9个.A={a1,a2}不算吗?
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![{a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数?为什么有8个而不是9个.A={a1,a2}不算吗?](/uploads/image/z/2479133-29-3.jpg?t=%7Ba1%2Ca2%7D%26%238838%3BA%26%238838%3B%7Ba1%2Ca2%2Ca3%2Ca4%2Ca5%7D%E6%B1%82%E6%BB%A1%E8%B6%B3%E4%B8%8A%E8%BF%B0%E6%9D%A1%E4%BB%B6%E7%9A%84%E9%9B%86%E5%90%88A%E7%9A%84%E4%B8%AA%E6%95%B0%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E6%9C%898%E4%B8%AA%E8%80%8C%E4%B8%8D%E6%98%AF9%E4%B8%AA.A%3D%7Ba1%2Ca2%7D%E4%B8%8D%E7%AE%97%E5%90%97%3F)
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{a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数?为什么有8个而不是9个.A={a1,a2}不算吗?
{a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数?
为什么有8个而不是9个.A={a1,a2}不算吗?
{a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数?为什么有8个而不是9个.A={a1,a2}不算吗?
分别是{a1,a2},{a1,a2,a3},{a1,a2,a4},{a1,a2,a5}
{a1,a2,a3,a4},{a1,a2,a3,a5},{a1,a3,a4,a5}
{a1,a2,a3,a4,a5}