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= 15/4 - 13/10 (samakan penyebut menjadi per 20)
= 75/20 - 26/20
= 49/20
= 2 9/20
5 1/2 - 3 1/4
= 11/2 - 13/4 (samakan penyebut menjadi per 4)
= 22/4 - 13/4
= 9/4
2. 5 1/2 - 3 1/4 = 11/2 - 13/4 = 22/4 - 13/4 = 9/4 = 2 1/4