2、x>-1},那么正确的结论是( C )A.0⊆AB.{0}∈AC.{0}⊆AD.∅∈A解析:∵0∈A,∴{0}⊆A.2.已知集合A={2,-1},B={m2-m,-1},且A=B,则实数m=( C )A.2B.-1C.2或-1D.4解析:∵A=B,∴m2-m=2,即m2-m-2=0,∴m=2或m=-1.3.定义集合运算A◇B={c
3、c=a+b,a∈A,b∈B},若A={0,1,2},B={3,4,5},则集合A
4、◇B的子集个数为( A )A.32B.31C.30D.14解析:∵A={0,1,2},B={3,4,5},又A◇B={c