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a.b = 216 ⇒ a(a+6) = 216
a² + 6a-216 = 0
(a+18)(a-12)= 0
jadi a = -18 atau a = 12 tetapi a yang memenuhi = 12
b-a = 6
b = a+6 = 12+6 = 18
jadi bil terbesar adalah 18