tolong dong jawab no 1,2 3 4 5

1) - 80 + 100 = 20 cm

2) 6/8 + 3/8
= 9/8
= 1 ⅛ liter

3) 3/8 + ½ + ⅛
= 3/8 + (½ × 4/4) + ⅛
= ⅜ + 4/8 + ⅛
= 8/8
= 1 kg

4) 7/8 - ¼
= 7/8 - (¼ × 2/2)
= 7/8 - 2/8
= 5/8 kw

5) 1 + ¾ - ½
= 4/4 + 3/4 - (½ × 2/2)
= 4/4 + 3/4 - 2/4
= 7/4 - 2/4
= 5/4 kw