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tontuevuong
2 năm trước
Cho các số a,b,c thỏa mãn $\frac{3}{a + b}$ = $\frac{2}{b + c}$ = $\frac{1}{c + a}$ ( giả thiết các tỉ số đều có nghĩa> Tính giá trị biểu thức P = $\frac{a + b - 2019c}{a + b + 2018c}$
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