B(4) = {...; - 8 ; - 4 ; 0 ; 4 ; 8 ;...}
Ư(7) = {\(\pm1;\pm7\)}
Ư(12) = {\(\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\)}
B (4)={0,4,8,12,14,...}
Ư (7)={1,7}
Ư (12)={1,2,3,4,6,12}
B(4) = {...; - 8 ; - 4 ; 0 ; 4 ; 8 ;...}
Ư(7) = {±1;±7±1;±7}
Ư(12) = {±1;±2;±3;±4;±6;±12±1;±2;±3;±4;±6;±12}
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