Tìm stn M nhỏ nhất có 4 chữ số thỏa mãn điều kiện : M = a+b = c+d = e+f biết a,b,c,d,e,f thuộc tập hợp N* và $\frac{a}{b}$ = $\frac{14}{22}$ ; $\frac{c}{d}$ = $\frac{11}{13}$ ; $\frac{e}{f}$ = $\frac{13}{17}$

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