Question

Efetue as operações e apresente a resposta na forma irredutível.
a) 1/4 + 1/5

b) 3/5 + 1/3

c) 1/8 + 1/4

d) 4/7 + 1-3

e) 2/5 + 1/10

f) 5/6 + 2/3

Answer 1

$a) \frac{1}{4} + \frac{1}{5} = \frac{5}{20}+ \frac{4}{20} = \frac{9}{20} ;$$c) \frac{1}{8} + \frac{1}{4} = \frac{1}{8}+ \frac{2}{8} = \frac{3}{8} ;$ $b) \frac{3}{5} + \frac{1}{3} = \frac{9}{15}+ \frac{5}{15} = \frac{14}{15} ;$ $d) \frac{4}{7} - 2 = \frac{4}{7} - \frac{14}{7} =- \frac{10}{7}$ $e) \frac{2}{5} + \frac{1}{10} = \frac{4}{10}+ \frac{1}{10} = \frac{5}{10}= \frac{1}{2} ;$ $f) \frac{5}{6} + \frac{2}{3} = \frac{5}{6}+ \frac{4}{6} = \frac{9}{6}= \frac{3}{2}$