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15. 2,4
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= 16/5 + 5/9 + 5/6
= 864/270 + 150/270 + 225/270
= 1239/270
= 4 159/270
= 4 53/90 atau 4,59
15) (1,2 x 1 1/2) : 3/4
= (12/10 x 3/2) x 4/3
= 18/10 x 4/3
= 12/5
= 2 2/5 atau 2,4