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tadxd2004
2 năm trước
Chứng minh các đa thức sau vô nghiệm : a) $x^{2}$ +1 b)-2 $x^{2}$ - 1 c) (x-1)$^{2}$ + 2 d)-(x- $\frac{1}{2}$ -(x- $\frac{1}{2}$) $^{2}$ - $\frac{2}{5}$ e) $x^{2}$ -2x+2
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