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3 1/2 = 7/2
2 1/3 = 7/3
nama lain 7/2 =21/6 ----> samakan penyebut, KPK dari 3 dan 2
7/3 = 14/6
(21/6 - 14/6)² (7/6)² 49/36
----------------- = --------- = ----------- = 49/36 x 6/35 = 49 / 210 = 7/30
21/6 + 14/6 35/6 35/6