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ubah pecahan campuran menjadi pecahan biasa
= 9/4 : 1/5 × 1/5 : 2/9
= 9/4 × 5/1 × 1/5 : 2/9
= 45/4 × 1/5 × 9/2
= 45/4 × 9/10
= 405/40
= 10 5/40
= 10 1/8
2) 3 1/2 + 8/20 × 1/4 : 5/6
= 7/2 + 8/20 × 1/4 : 5/6
= 7/2 + 8/80 : 5/6
= 7/2 + 8/80 × 6/5
= 7/2 + 48/400
samakan penyebut
= 1.400/400 + 48/400
= 1.448/400
= 3 248/400
= 3 124/200
= 3 62/100
= 3 31/50