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Penjelasan dengan langkah-langkah:
A. 8/12 + 2/12
= (8+2)/12
=10/12
=5/6
B. 8/12 - 2/12
= (8-2)/12
= 6/12
= 1/2
C. 11/15 + 3/15
= (11 + 3)/15
= 14/15
D. 11/15 - 3/15
= (11 - 3)/15
= 8/15
E. 35/85 + 20/85
= (35+20)/85
= 55/85
= 11/17
F. 35/85 - 20/85
= (35-20)/85
= 15/85
= 3/17
G. 9/18 + 3/18
= (9+3)/18
= 12/18
= 2/3
H. 9/18 - 3/18
= (9-3)/18
= 6/18
= 1/3
a.8/12 + 2/12 = 10/12 = 5/6
b, 8/12 - 2/12 = 6/12 = 1/2
c.11/15 + 3/15 = 14/15
d.11/15 - 3/15 = 8/15
e.35/85 + 20/85 = 55/85 = 11/17
f.35/85 - 20/85 = 15/85 = 3/17
g.9/18 + 3/18 = 12/18 = 2/3
h.9/18 - 3/18 = 6/18 = 1/3