集合22222的题目,1．设集合A = {1},C = {x|x(x − 1)(x + 1) = 0},则满

集合22222的题目,
1．设集合A = {1},C = {x|x(x − 1)(x + 1) = 0},则满足A⊂≠B⊆C的集合B的个数为( )
A．1x05x05B．2x05x05C．3x05x05D．4
2．已知a、b∈R,集合A = {x|x2 − ax + 2 = 0},B = {x|x2 − x + b = 0},且A∩(∁RB) = {1},则集合B = ( )
A．{2}x05x05x05B．{−1,2}
C．{−2,2}x05x05D．{−2,−1}
3．定义card(M)为有限集M中元素的个数．例如,M = {a,b,c},则card(M) = 3．已知集合A = {1,3,5,7,8},B = {2,5,8,9},则card(A∪B) = ( )
A．2x05x05B．5x05x05C．7x05x05D．9
4．设集合D = {(x,y)|y≤1340 − 670x,x∈N,y∈N},则D中元素的个数为( )
A．2010x05B．2011x05C．2012x05D．2013