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trangthuyvi9424
2 năm trước
Chứng minh rằng các biểu thức sau luôn luôn có giá trị dư¬ơng với mọi giá trị của biến x : a) 9x2 - 6x +2; b) x2 + x + 1; c) 2x2 + 2x + 1.
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