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truongminhphuc18
2 năm trước
Cho biểu thức: B= $\frac{x^2+2x}{2x+10}$ +$\frac{x-5}{x}$ +$\frac{50-5x}{2x.(x+5)}$ Tìm x để B>0; B<0; B=0; B=$\frac{1}{4}$
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