Question

Виконай дії а)5/8+7/12 б)6/7-9/11 в)3/4+5/6+7/12

Answer 1

$a) \frac{5}{8} + \frac{7}{12} = \frac{5 \times 3 + 7 \times 2}{24} = \frac{15 + 14}{24 } = \frac{29}{24} = 1 \frac{5}{24} \\ b) \frac{6}{7} - \frac{9}{11} = \frac{6 \times 11 - 9 \times 7}{77} = \frac{66 - 63}{77} = \frac{3}{77} \\ c)\frac{3}{4} + \frac{5}{6} + \frac{7}{12} = \frac{3 \times 3 + 5 \times 2 + 7 \times 1}{12} = \frac{9 + 10 + 7}{12} = \frac{26}{12} = \frac{13}{6} = 2\frac{1}{6}$