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1.Cho [TEX]m^2+n^2=p^2+q^2[/TEX] va [TEX]mp+nq=0[/TEX]
Tinh mn+pq=?
2. Tim 4 so nguyen a, b, c, d thoa man
[TEX]|a-b|+|b-c|+|c-d|+|d-a|[/TEX]

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chú ý latex
Tinh mn+pq=?
2. Tim 4 so nguyen a, b, c, d thoa man
[TEX]|a-b|+|b-c|+|c-d|+|d-a|[/TEX]
chú ý latex
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