kakak bantu saya pake cara besok di kumpul

1.
a. 2/3 + 3/4 = 8/12 + 9/12 = 17/12 = 1 5/12
b. 2 5/6 + 3 7/8 = 2 20/24 + 3 21/24 = 5 41/24 = 6 17/24

2,
a. 2/3 + (-2/3) = 0
b. (-7 2/3) + 7 2/3 = 0

3.
a. 1/2 +(-1/3) = 3/6 - 2/6 = 1/6
b. (-3 1/4) + (-2 1/3) = (- 3 3/12) + (- 2 4/12) = (-5 7/12)

4.a.
1/2 + ... = 2/3
2/3 - 1/2 =4/6 - 3/6 = 1/6
maka
1/2 + 1/6 = 2/3

4.b.
1/4 + ... = 5/6
5/6 -1/4 = 10/12 - 3/12 = 7/12
maka
1/4 + 7/12 = 5/6