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thaouyen
2 năm trước
chứng minh các định lý sau: a. nếu x $\neq$ 0 hay y $\neq$ 0 thì $x^{2}$ + y ² -2x -2y +2 $\neq$ 0 b. nếu a ≥ 0 và b ≥ 0 thì a+ b ≥ 2 √ab $x^{2}$
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