(12,20)→ ¬Y; 20

Toán BÁO CÁO TOÁN HỌC FANS AND BUNDLES IN THE GRAPH OF PAIRWISE SUMS AND PRODUCT POTX

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Đáp án tham khảo

20: (12,20)→ ¬y; 20: (20,19)→ ¬x; 21: (21,20) → ¬z; 90: (19,90) → ¬x;