Question

2-calcule as expressões:

a) 1/3+2/5

b) 3/4+5/6-1/2

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

d) 4-1/7
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Answer 1

Resposta:

$a) \frac{1}{3} + \frac{2}{5} = \frac{5}{15} + \frac{6}{15} = \frac{11}{15}$

$b) \frac{3}{4} + \frac{5}{6} - \frac{1}{2} = \frac{9 + 10 - 6}{12} = \frac{13}{12}$

$c) \frac{1}{6} + \frac{5}{4} + \frac{2}{3} = \frac{2 + 15 + 8}{12} = \frac{25}{12}$

$d) \frac{4}{1} - \frac{1}{7} = \frac{28 - 1}{7} = \frac{27}{7}$

Answer 2

Explicação passo-a-passo:

a) 1/3 + 2/5 - mmc de 3,5 = 15

15/3 x 1 = 5

15/5 x 2 = 6

6+5/15 = 11/15

b) 3/4 + 5/6 -1/2 - mmc de 2, 4, 6 = 12

12/4 x 3 = 9

12/6 x 5 = 10

12/2 x (-1) = -6

9 + 10 - 6 / 12 = 13/12

c) 1/6 + 5/4 + 2/3 - mmc de 3, 4, 6 = 12

12/6 x 1 = 2

12/4 x 1 = 15

12/3 x 2 = 8

2 + 15 + 8 / 12 = 25/12

d) 4 - 1/7

7x4 - 1 = 27/7

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