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anhle160903
2 năm trước
Viết các biểu thức sau dưới dạng bình phương của một tổng hoặc bình phương của một hiệu $a)$ $x^{2}$ $-$ $x+\frac{1}{4}$ $b)$ $x^{2}$ $+$ $x+\frac{1}{4}$
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