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hongsuong17217
2 năm trước
cho a,b,c là các số thực dương thỏa mãn a+b+c=3. Tìm giá trị nhỏ nhất của biểu thức: P = $\frac{a}{b}$ + $\frac{b}{c}$ + $\frac{c}{a}$ + $\frac{3abc}{ab+bc+ca}$
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