1 – 2 + 3 – 4 + 5 – 6 + ….. + 39 – 40 = By Admin ReiPosted on December 4, 2022 1 – 2 + 3 – 4 + 5 – 6 + ….. + 39 – 40 = Jawab: 40: 2=20 1-2=-1 20×-1 = -20maaf kalau salah