集合A ={x |x²–4=0}与集合B =x ||x |=2}的关系是
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集合A ={x |x²–4=0}与集合B =x ||x |=2}的关系是
集合A ={x |x²–4=0}与集合B =x ||x |=2}的关系是
集合A ={x |x²–4=0}与集合B =x ||x |=2}的关系是
A=B
b涵于a,a包含于b
A包函B