Question

1- Efetue as adições:
a) (+3/5) + (+1/2) =
b) (-2/3) + (+5/4) =
c) (-4/9) + (+2/3) =
d) (-3/7) + (+2/9) =
e) (-1/8) + (-718) =
me ajudem pfv​

Answer 1

Oie, Td Bom?!

a)

= 3/5 + 1/2

= [3 . 2]/[5 . 2] + [1 . 5]/[2 . 5]

= 6/10 + 5/10

= [6 + 5]/10

= 11/10

b)

= - 2/3 + 5/4

= - [2 . 4]/[3 . 4] + [5 . 3]/[4 . 3]

= - 8/12 + 15/12

= [- 8 + 15]/12

= 7/12

c)

= - 4/9 + 2/3

= - 4/9 + [2 . 3]/[3 . 3]

= - 4/9 + 6/9

= [- 4 + 6]/9

= 2/9

d)

= - 3/7 + 2/9

= - [3 . 9]/[7 . 9] + [2 . 7]/[9 . 7]

= - 27/63 + 14/63

= [- 27 + 14]/63

= [- 13]/63

= - 13/63

e)

= - 1/8 + (- 7/18)

= - 1/8 - 7/18

= - (1/8 + 7/18)

= - ([1 . 9]/[8 . 9] + [7 . 4]/[18 . 4])

= - (9/72 + 28/72)

= - [9 + 28]/72

= - 37/72

Att. Makaveli1996

Answer 2

a)

(+3/5) + (+1/2)

3/5 + 1/2

6 + 5/10

11/10

b)

(-2/3) + (+5/4)

- 2/3 + 5/4

- 8 + 15/12

7/12

c)

(-4/9) + (+2/3)

- 4/9 + 2/3

- 4 + 6/9

2/9

d)

(-3/7) + (+2/9)

- 3/7 + 2/9

- 27 + 14/63

- 13/63

e)

(1/8) + (-7/8)

1/8 - 7/8

1 - 7/8

- 6/8 ÷ 2

- 3/4