偶是数学白痴...= =高中的数学让偶想撞豆腐...记都记不过来...用适当的符号填空:0_{0} Φ_{0} Φ_A (A={x|3k+2 k∈})符号打打太麻烦了...偶用中文代替了...= =A={x|x=2k-1 k属于Z} B={x|x=2s+1 s属于Z}
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