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jumlah 15 -->a-b +a +a +b = 15
3a = 15
a= 5
.
(a-b)^2 + a^2 + (a+b)^2 = 83
(5-b)^2 + 25 + (5+b)^2 = 83
25-10b +b^2 + 25 + 25 + 10b +b^2 = 83
2b^2 = 83 -75 = 8
b^2 = 4
b = 2 atau b = -2
bilangan itu = (a-b), (a), (a+b) --> (5-2), (5),(5+2)
--> 3,5,7
atau 7,5 3