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Panuto: Tukuyin kung anong property of addition ang ipinakikita sa equation,
11.21 + 13 = 13 + 21
12. 74 + 0 = 74
13. 11 + (2 + 5) = (11+2) + 5 = 18
14. (6 + 4)+ 15 = 6 + (4 + 15)= 25
15. 9 + 3 = 3 +9?
pasagot po now na ​