Question

Me ajudem por favor ​

Answer 1

Explicação passo-a-passo:

1.

a) (+3/5)+(-7/5)

3/5 - 7/5 = -4/5 (ou -0,8)

b) (-2/3)+(+5/7)

mmc entre 3 e 7= 21

-14/21 + 15/21 = 1/21

c) (0,3)+(-0,7)

3/10 - 7/10 = -4/10

-0,4

d) (+4/7)+(-11/7)+(-19/7)

4/7 - 11/7 - 19/7

4/7 - 30/7 = -26/7

e) (-1,47)+(-2,5)+(-0,03)

-147/100 -25/10 -3/100

mmc entre 10 e 100=100

-147/100 -250/100 -3/100

-397/100 -3/100

-400/100 = -4,00

2.

a) 10/3 -3/5

mmc 3 e 5=15

50/15 - 9/15 = 41/15

b) -3/5 +10/3

-9/15 + 50/15 = -41/15

3.

a) (1/2 + 2/3) -5/4

mmc 2 e 3=6

(3/6 + 4/6) -5/4

7/6 - 5/4

mmc 6 e 4= 12

14/12 - 15/12= -1/12

b) 1/2 (2/3 - 5/4)

mmc 3 e 4= 12

1/2 (8/12 - 15/12)

1/2 - 7/12

mmc 2 e 12=12

6/12 - 7/12 = -1/12