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20 sebagai angka tengah . jadi 3 bilangannya antara lain : 19, 20, 21 . bil terbesar 21 . maaf kalo salah
b = beda
a-b + a + a+b = 60
3a = 60
a = 60/3
a = 20
(a-b) (a) (a+b) = 7820
a(a²-b²) = 7820
20 (20² - b²) = 7820
20² - b² = 7820/20
400 - b² = 391
b² = 400 - 391
= 9
b = √9
b = 3
bilangan terbesar = a+b
= 20 + 3 = 23