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=2/3 - 3/5 + 1/7 ----->KPK dari 3,5,dan 7 adalah 105
= (105:3)x2 / 105 - (105:5) x 3 / 105 + (105:7)x1 / 105
= 35x2 / 105 - 21x3 / 105 + 15x1 / 105
= 70/105 - 63/105 + 15/105
= (70-63+15) / 105
= 22/105
KPK dari 9,5 dan 7 = 315
Sehingga,
= atau
Semoga membantu :)