Question

ME AJUDEM POR FAVOR 30 PTS PARA QUEM ME RESPONDER CORRETAMENTE POR FAVOR (URGENTE)!!!​

Answer 1

a)

$- ( \frac{3}{4} + \frac{5}{6} ) + \frac{10}{12} \\ \\ - ( \frac{3 \times 3}{4 \times 3} + \frac{5 \times 2}{6 \times 2} ) + \frac{10}{12} \\ \\ - ( \frac{9}{12} + \frac{10}{12} ) + \frac{10}{12} \\ \\ - \frac{19}{12} + \frac{10}{12} = - \frac{ 9}{12} =- \frac{ 3}{4}$

b)

$- 5 + ( \frac{6}{8} - \frac{5}{4} ) + \frac{5}{10} \\ \\ - 5 + ( \frac{6}{8} - \frac{5 \times 2}{4 \times 2} ) + \frac{5}{10} \\ \\ - 5 + ( \frac{6}{8} - \frac{10}{8} ) + \frac{5}{10} \\ \\ - 5 + ( - \frac{4}{8} ) + \frac{5}{10} \\ \\ - 5 - \frac{4}{8} + \frac{5}{10} \\ \\ - 5 - \frac{4 \div 4}{8 \div 4} + \frac{5 \div 5}{10 \div 5} \\ \\ - 5 - \frac{1}{2} + \frac{1}{2} \\ \\ - 5$