2 1/2+1 1/5-3 3/10

解答

2 \frac{1}{2} + 1 \frac{1}{5} - 3 \frac{3}{10}

\frac{2}{5}

十进制

0.4

求解步骤

2 \frac{1}{2} + 1 \frac{1}{5} - 3 \frac{3}{10}

2 \frac{1}{2} + 1 \frac{1}{5} = 3 \frac{7}{10}

= 3 \frac{7}{10} - 3 \frac{3}{10}

3 \frac{7}{10} - 3 \frac{3}{10} = \frac{2}{5}

= \frac{2}{5}

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