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12 x 15 = 180
a - b = 3
bilangan a = □□+3
bilangan b = □□
4□ + 3 = 27
4□ = 27 - 3
= 24
□ = 24 ÷ 4
= 6
bilangan a = □□ +3
= 6×2 + 3
= 15
bilangan b = □□
= 6×2
12
a × b = 15 × 12
=180
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