摘要:若(x+1)n=xn+-+ax3+bx2+-+1(n∈N*).且a∶b=3∶1.那么n= .
网址:http://m.1010jiajiao.com/timu_id_425366[举报]
若集合M={ x |-3<x<1, x∈R },N={ x |-1≤x≤2, x∈Z },则M∩N= ( )
A.{0} B.{-1,0} C.{-1,0,1} D.{-2,-1,0,1,2}
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网址:http://m.1010jiajiao.com/timu_id_425366[举报]
若集合M={ x |-3<x<1, x∈R },N={ x |-1≤x≤2, x∈Z },则M∩N= ( )
A.{0} B.{-1,0} C.{-1,0,1} D.{-2,-1,0,1,2}
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