3 + 2 = - 5, 4 + 3 = - 7, 5 + 1 = - 6, 6 + 3 = - 9, 7 + 3 = - 10, 2 + 2= - 4, 11 + 1= - 12, 10 + 4= - 14, 9 + 9 = - 18, 10 + 10 = - 20,

Penjumlahan bilangan 1 -20

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