Mathematics
Senior High
解き方を教えて欲しいです。
よ. 3. Nを自然数全体, Zを整数全体の集合とする.
次の集合を要素を書き並べて表せ.
(1){x/x∈N, x<10, xは素数 }
(2){3n+1|n∈Z-1 < n < 4}
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