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{4} {2,3,4} {1,3,4} {1,2,3,4}
={1,2,3,4}, ={x∈N||x|≤2},则A.∩B=( ) A.{1,2,3,4}B.{﹣2,﹣1,0,1,2,3,4} {1,2} {2,3,4}
{1,2,3,4} {1,2,3} {2,3} {2,3,4}
={x|x=2n,n∈N*}, ={x≤2},则A.∩B.=( ) A.{2}B.{2,4} {2,3,4} {1,2,3,4}
收入效应X1X﹡ =-2, 替代效应X﹡X2=3 收入效应X1X﹡ =-5, 替代效应X﹡X2=2 收入效应X1X﹡ =-5, 替代效应X﹡X2=8 收入效应X1X﹡ = 5, 替代效应X﹡X2=2 收入效应X1X﹡ = 5, 替代效应X﹡X2=-5
{1,2} {1,2,3} {2,3,4} {3,4}
={x∈N|0≤x≤5},∁A. ={1,3,5},则集合B.=( ) A.{2,4}B.{0,2,4} {0,1,3} {2,3,4}
收入效应X1X*=-2, 替代效应X*X2=+3 收入效应 X1X*=-5, 替代效应 X*X2=+2 收入效应 X1X*=-5, 替代效应 X*X2=+8 收入效应 X1X*=+5, 替代效应 X*X2=+2 收入效应 X1X*=+5, 替代效应 X1X*=-5
{1,2,3} {2,3} {1,2} {2,3,4}
={1,2,3,4}, ={x∈R.|1<x≤4},则A.∩B.=( ) A.{1,2,3,4}B.{2,4} {2,3,4} {x|1<x≤4}
{1,2,3,4} {-2,-1,0,1,2,3,4}
{1,2} {2,3,4}
={x|x<3}. ={1,2,3,4},则( R.A.)∩B.= (A.){4} (B.){3,4} (C.){2,3,4} ( ){1,2,3,4}
x x≤3或x>4 x -1x 3≤x<4 x -2≤x<-1
{1,2} {1,2,3} {2,3,4} {3,4}
={x|x≥3}, ={1,2,3,4,5}则A.∩B.=( ) A.{1,2,3}B.{2,3,4} {3,4,5} {1,2,3,4,5}