1.设非空集合A={x/-2≤x≤a},B={y/y=2x+3,x∈A},C+{z=x^2,x∈A},且C是B的子集,求实数a的取值范围.2.已知集合P={x/x=a^2+4a+1,a∈R},Q={x/x=-b^2+2b+3,b∈R},求P∩Q和P∪(Q的补集).3.M={x/x=2n+1,n∈Z},N={x/x=4k±1,k∈Z},求
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