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phamanh6465
2 năm trước
cho x,y,z là 3 số thực tùy ý thỏa mãn x+y+z=0 và −1≤x≤1,−1≤1≤1,−1≤z≤1.CMR đa thức x^2+y^4+z^6 có giá trị ko lớn hơn 2
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