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解;∵所有被3除餘1的正整數都可寫成3的整數倍加1的形式.即x=3k+1,k∈N,∴用描述法表示“被3除餘1的正整數組成的集合”:{x|x=3k+1,k∈N}故答案為:{x|x=3k+1,k∈N}.
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