Ta có : \(\frac{2112}{3113}=\frac{192}{283}\)
Tìm MSC của 3; 31; 311; 283.
3 × 31 × 311 × 283 = 8185209
\(\frac{2}{3}=\frac{5456806}{8185209}\)
\(\frac{21}{31}=\frac{5544819}{8185209}\)
\(\frac{211}{311}=\frac{5553309}{8185209}\)
\(\frac{192}{283}=\frac{5553216}{8185209}\)
Vì 5456806 < 5544819 < 5553216 < 5553309 nên \(\frac{2}{3}< \frac{21}{31}< \frac{2112}{3113}< \frac{211}{311}\)
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