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Karena 8 dan 7 bukan satuan
yang satuan itu 6
16.3 3/4 + 2/5
15/4 + 2/5
75/20 + 8/20
83/20 = 4.15 = b.4
17.5/7 x 8 = 5 5/7
maaf kalau salah yah......
17 sih agak bingung