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a. 1 cm + 3 cm = 4 cm, ke arah kanan, karena positif
b. 4 cm - 1.5 cm = 2.5 cm, ke arah kanan, karena positif
c. 4cm + 2cm - 3cm = 3 cm, ke arah kanan, karena positif
2. digambarkan sendiri menggunakan perbandingan
3. a. 40N + 30N = 70N
b. 30N - 40N = -10N