Question

A) 3/4+ 5/6 b) 8/3 - 5/8 c) 1/5 + 5/9 + 2 d) 7- 8/7 + 1/4

Answer 1

Explicação passo-a-passo:

a)

$= \frac{3}{4} + \frac{5}{6}$

$= \frac{3 \times 3}{4 \times 3} + \frac{5 \times 2}{6 \times 2}$

$= \frac{9}{12} + \frac{10}{12}$

$= \frac{19}{12}$

b)

$= \frac{8}{3} - \frac{5}{8}$

$= \frac{ 8\times 8}{3 \times 8} - \frac{5 \times 3}{8 \times 3}$

$= \frac{64}{24} - \frac{15}{24}$

$= \frac{49}{24}$

c)

$= \frac{1}{5} + \frac{5}{9} + 2$

$= \frac{1 \times 9}{5 \times 9} + \frac{5 \times 5}{9 \times 5} + \frac{2 \times 45}{45}$

$= \frac{9}{45} + \frac{25}{9} + \frac{90}{45}$

$= \frac{9 + 25 + 90}{45}$

$= \frac{124}{45}$

d)

$= 7 - \frac{8}{7} + \frac{1}{4}$

$= \frac{7 \times 28}{28} - \frac{8 \times 4}{7 \times 4} + \frac{1 \times 7}{4 \times 7}$

$= \frac{196}{28} - \frac{32}{28} + \frac{7}{28}$

$= \frac{196 - 32 + 7}{28}$

$= \frac{171}{28}$

Answer 2

Resposta:

Explicação passo-a-passo:

.

a) 3/4 + 5/6 = ...(m.m.c. = 12)

....9/12 + 10/12 = 19/12

.

b) 8/3 - 5/8 =. ..(m.m.c. = 24)

.... 64/24 - 15/24 = 49/24

.

c) 1/5 + 5/9 + 2 = ..(mmc = 45)

... 9/45 + 25/45 + 90/45 = 124/45

.

d) 7 - 8/7 +. 1/4 = ..(mmc = 28)

....196/28 - 32/28 + 7/28 =

....164/28 + 7/28 = 171/28

.

(Espero ter colaborado)