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MinhAnh2000
2 năm trước
Cho bt B =( $\frac{2}{2x+1}$- $\frac{3}{1-4x^2}$ - $\frac{2}{2x-1}$ ): $\frac{4x^2 +1}{4x^2-1}$ Chứng minh B<0 ∀x thỏa mãn ĐKXĐ của B
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