设P是一个数集,且至少含有两个数,若对任意a、b∈R,都有a+b、a-b,ab、 ∈P(除数b≠0),则称P是一个数域.例如有理数集Q是数域;数集 F={a+2^(1/2)b,ab属于Q}也是数域.有下列命题:①整数集是
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![设P是一个数集,且至少含有两个数,若对任意a、b∈R,都有a+b、a-b,ab、 ∈P(除数b≠0),则称P是一个数域.例如有理数集Q是数域;数集 F={a+2^(1/2)b,ab属于Q}也是数域.有下列命题:①整数集是](/uploads/image/z/6834289-49-9.jpg?t=%E8%AE%BEP%E6%98%AF%E4%B8%80%E4%B8%AA%E6%95%B0%E9%9B%86%2C%E4%B8%94%E8%87%B3%E5%B0%91%E5%90%AB%E6%9C%89%E4%B8%A4%E4%B8%AA%E6%95%B0%2C%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8Fa%E3%80%81b%E2%88%88R%2C%E9%83%BD%E6%9C%89a%2Bb%E3%80%81a%EF%BC%8Db%2Cab%E3%80%81+%E2%88%88P%EF%BC%88%E9%99%A4%E6%95%B0b%E2%89%A00%EF%BC%89%2C%E5%88%99%E7%A7%B0P%E6%98%AF%E4%B8%80%E4%B8%AA%E6%95%B0%E5%9F%9F%EF%BC%8E%E4%BE%8B%E5%A6%82%E6%9C%89%E7%90%86%E6%95%B0%E9%9B%86Q%E6%98%AF%E6%95%B0%E5%9F%9F%EF%BC%9B%E6%95%B0%E9%9B%86+F%3D%7Ba%2B2%5E%281%2F2%29b%2Cab%E5%B1%9E%E4%BA%8EQ%7D%E4%B9%9F%E6%98%AF%E6%95%B0%E5%9F%9F%EF%BC%8E%E6%9C%89%E4%B8%8B%E5%88%97%E5%91%BD%E9%A2%98%EF%BC%9A%E2%91%A0%E6%95%B4%E6%95%B0%E9%9B%86%E6%98%AF)
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