Question

Calcular as adições é subtrações

A)2/7+10/5

B) 5/9-2/4

C)1/2+2/3

D)5/3-3/4

E)3/5+8/10

G)1/4+2/3+5/6

H)2/5-1/3+1/2

ME AJUDEM PFVR!!!

Answer 1

Resposta: A) 16/7; B) 1/18; C) 6/7; D) 11/12; E) 7/5; G) 7/4 e H) 17/30

Explicação passo a passo:

$A) \frac{2}{7} \ + \ \frac{10}{5} = \frac{2 . 5 + 7 . 10 }{7 . 5} = \frac{10 + 70}{35} = \frac{80}{35} = \frac{16}{7} \\ \\ B) \frac{5}{9} \ - \ \frac{2}{4} = \frac{4 . 5 - 9 . 2}{4 . 9} = \frac{20 - 18}{36} = \frac{2}{36} = \frac{1}{18} \\ \\ C) \frac{1}{2} \ + \ \frac{2}{3} = \frac{3 . 1 + 2 . 2}{2 . 3} = \frac{3 + 4}{6} = \frac{7}{6} \\ \\ D) \frac{5}{3} \ - \ \frac{3}{4} = \frac{4 . 5 - 3 . 3}{3 . 4} = \frac{20 - 9}{12} = \frac{11}{12}$

$E) \frac{3}{5} \ + \ \frac{8}{10} = \frac{3 . 10 + 5 . 8}{5 . 10} = \frac{30 + 40}{50} = \frac{70}{50} = \frac{7}{5} \\ \\ F) \ ? \ ? \ ? \\ \\ G) \frac{1}{4} \ + \ \frac{2}{3} \ + \ \frac{5}{6} = \frac{ 1.3 + 4 . 2}{3 . 4} \ + \ \frac{5}{6} = \frac{3 + 8}{12} \ + \ \frac{5}{6} = \frac{11}{12} \ + \ \frac{5}{6} = \frac{11 . 6 + 12. 5}{12 . 6} = \frac{66 + 60}{72} = \\ \\ \frac{126}{72} = \frac{42}{24} = \frac{7}{4}$

$H) \frac{2}{5} \ - \ \frac{1}{3} \ + \ \frac{1}{2} = \frac{2.3 - 5 . 1}{5 . 3} \ + \ \frac{1}{2} = \frac{6 - 5}{15} \ + \ \frac{1}{2} = \frac{1}{15} \ + \ \frac{1}{2} = \frac{1 . 2 + 15 . 1}{2 . 15} = \frac{2 + 15}{30} = \frac{17}{30}$