已知集合M满足M⊆{a1,a2,a3,a4}.且M∩{a1,a2,a3}={a1,a2},则这样的M有_____个.
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![已知集合M满足M⊆{a1,a2,a3,a4}.且M∩{a1,a2,a3}={a1,a2},则这样的M有_____个.](/uploads/image/z/3674160-0-0.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88M%E6%BB%A1%E8%B6%B3M%26%238838%3B%EF%BD%9Ba1%2Ca2%2Ca3%2Ca4%EF%BD%9D.%E4%B8%94M%E2%88%A9%EF%BD%9Ba1%2Ca2%2Ca3%EF%BD%9D%3D%EF%BD%9Ba1%2Ca2%EF%BD%9D%2C%E5%88%99%E8%BF%99%E6%A0%B7%E7%9A%84M%E6%9C%89_____%E4%B8%AA.)
已知集合M满足M⊆{a1,a2,a3,a4}.且M∩{a1,a2,a3}={a1,a2},则这样的M有_____个.
已知集合M满足M⊆{a1,a2,a3,a4}.且M∩{a1,a2,a3}={a1,a2},则这样的M有_____个.
已知集合M满足M⊆{a1,a2,a3,a4}.且M∩{a1,a2,a3}={a1,a2},则这样的M有_____个.
M={a1,a2}.
M={a1,a2,a4}.
共2个
{a1,a2}.{a1,a2,a4}就这两个