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a, Tìm cặp số (x,y) thỏa mãn : $9x^{2}$ -$8y^{2}$ =15 b, Chứng minh rằng tồn tại số có dạng 20192019...201900...00 chia hết cho 2018 c,Chứng minh rằng A=$1^{3}$ +$2^{3}$ +$3^{3}$ +$4^{3}$ +...+$2016^{3}$ là số chính phương GIẢI giúp mình với mình đang vội ko spam nha
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