3 9/10 > 2 9/10 3 4/10 < 3 9/10
5 1/10 > 2 9/10 3 4/10 = 3 2/5
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Bài 2 : So sánh các hỗn số:
\(a)\)\(3\frac{9}{10}\)và \(2\frac{9}{10}\)
\(3\frac{9}{10}=\frac{39}{10}\)
\(2\frac{9}{10}=\frac{29}{10}\)
Vì \(\frac{39}{10}>\frac{29}{10}\)
\(\Rightarrow\)\(3\frac{9}{10}>2\frac{9}{10}\)
\(b)\)\(3\frac{4}{10}\)và \(3\frac{9}{10}\)'
\(3\frac{4}{10}=\frac{34}{10}\)
\(3\frac{9}{10}=\frac{39}{10}\)
Vì \(\frac{34}{10}< \frac{39}{10}\)
\(\Rightarrow\)\(3\frac{4}{10}< 3\frac{9}{10}\)
\(c)\)\(5\frac{1}{10}\)và \(2\frac{9}{10}\)
\(5\frac{1}{10}=\frac{51}{10}\)
\(2\frac{9}{10}=\frac{29}{10}\)
Vì: \(\frac{51}{10}>\frac{29}{10}\)
\(\Rightarrow\)\(5\frac{1}{10}>2\frac{9}{10}\)
\(d)\)\(3\frac{4}{10}\)và \(3\frac{2}{5}\)
\(3\frac{4}{10}=\frac{34}{10}=\frac{17}{5}\)
\(3\frac{2}{5}=\frac{17}{5}\)
Vì: \(\frac{17}{5}=\frac{17}{5}\)
\(\Rightarrow\)\(3\frac{4}{10}=3\frac{2}{5}\)