Question

Calcule e simplifique os resultados quando for possível:


5_+_7
8 12


7_-_1
9 6


4_+_1 - 5_
5 2 8


7_+3_-- 1
15 15 10


3_ -- 1_ -- 1
2 3 5





5_ 1 + 2
6 4 3





2_+ 1
3 7




1_+ 1_
8 9





Por favor; ^; help



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Answer 1

Olá.

A)MMC = 24

$\frac{5}{8} + \frac{7}{12} = \frac{15 + 14}{24} = \frac{29}{24}$

B)MMC = 18

$\frac{7}{9} - \frac{1}{6} = \frac{14 - 3}{18} = \frac{11}{18}$

C)MMC = 40

$\frac{4}{5} + \frac{1}{2} - \frac{5}{8} = \frac{32 + 20 -25 }{40} = \frac{27}{40}$

D)MMC = 30

$\frac{7}{15} + \frac{3}{15} - \frac{1}{10} = \frac{14 + 6 - 3}{30} = \frac{17}{30}$

E)MMC = 30

$\frac{3}{2} - \frac{1}{3} - \frac{1}{5} = \frac{45 - 10 - 6}{30} = \frac{29}{30}$

F) Esta faltando um sinal entre o 5 e o 1

G)MMC = 21

$\frac{2}{3} + \frac{1}{7} = \frac{14 + 3}{21} = \frac{17}{21}$

H)MMC = 72

$\frac{1}{8} + \frac{1}{9} = \frac{9 + 8 }{72} = \frac{17}{72}$