To solve the given expression \(2 \frac{2}{5} - \frac{13}{20}\), we need to first convert the mixed number \(2 \frac{2}{5}\) into an improper fraction. Then, we find a common denominator for the fractions and perform the subtraction.
混合数 \(2 \frac{2}{5}\) を不適切な分数に変換します。 \[ 2 \frac{2}{5} = 2 + \frac{2}{5} = \frac{10}{5} + \frac{2}{5} = \frac{12}{5} \]
次に、引き算を行います。 \[ \frac{12}{5} - \frac{13}{20} \] このために、共通の分母を見つけます。分母の最小公倍数は20です。 \[ \frac{12}{5} = \frac{12 \times 4}{5 \times 4} = \frac{48}{20} \] したがって、引き算は次のようになります。 \[ \frac{48}{20} - \frac{13}{20} = \frac{48 - 13}{20} = \frac{35}{20} \]
最後に、分数を約分します。 \[ \frac{35}{20} = \frac{7}{4} \]
\(\boxed{\frac{7}{4}}\)
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