Cho$ a,b \in N$ thỏa mãn $2a^{2} $chia hết cho b . Chứng minh rằng:$ a^{2}+b$ không phải là số chính phương
chắc a,b thuộc N* –  ๖ۣۜPXM๖ۣۜMinh4212♓ 31-12-15 10:03 PM
xem lại để thử chứ cho $a=0,b=4$ thì tổng $a^2$ với $b$ là chính phương –  tran85295 31-12-15 04:57 PM

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