Question

Calcule e simplifique. 1/10 + 7/10

5/6 - 1/6
1/10 +7/10 +- 3/10
7/15 - 3/15 - 1/15

Answer 1

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$\frac{1}{10} + \frac{7}{10} = \frac{8:2}{10:2} = \frac{4}{5} \\ \\ \frac{5}{6} - \frac{1}{6} = \frac{4:2}{6:2} = \frac{2}{3} \\ \\ \frac{1}{10} + \frac{7}{10} - \frac{3}{10} = \frac{8-3}{10} = \frac{5:5}{10:5} = \frac{1}{2} \\ \\ \frac{7}{15} - \frac{3}{15} - \frac{1}{15} = \frac{7-4}{15} = \frac{3:3}{15:3} = \frac{1}{5}$