满足M∪{a1,a2,a3}＝{a1,a2,a3,a4,a5,a6}的集合M的个数是多少?

满足M∪{a1,a2,a3}＝{a1,a2,a3,a4,a5,a6}的集合M的个数是多少? 满足M属于｛a1,a2,a3,a4｝,且M∩｛a1,a2,a3｝=｛a1·a2｝的集合M的个数是多少?为什么? 1.满足M⊆{a1,a2,a3,a4},且M∩{a1,a2,a3}={a1,a2}的集合M的个数是_____ 满足M ｛a1,a2,a3,a4｝,且M∩｛a1 ,a2,a3｝={ a1•a2}的集合M的个数是 满足属于a1,a2,a3,a4,且M与a1,a2,a3的交集是a1,a2,问集合M的个数? .设{a1,a2}（右倒的“∪”下面加一个≠）M⊆{a1,a2,a3,a4,a5}集合M的个数是? {a1,a2}⊆A⊆{a1,a2,a3,a4,a5}求满足上述条件的集合A的个数? 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___ 满足M包含于｛a1,a2,a3,a4},且M交{a1,a2,a3}={a1,a2}的集合M为? 已知集合A={a1,a2,a3,a4,a5,a6,a7},A∪B={a1,a2,a3,a4,a5,a6,a7.,a100 已知等比数列an满足：a1+a2+a3+a4+a5=3,则a1-a2+a3-a4+a5的值是 a1=8,a7=5832,a1/a2=a2/a3=a3/a4=a4/a5=a5/a6=a6/a7,求a5的值