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Sagot :

BC= 5/4 - 1/3 = 15/12 - 4/12 = 11/12

CA = 11/12 - 11/18 = 33/ 36 - 22/36 = 11/36

AB + BC + CA = 5/4 + 11/12 + 11/36 = 45 / 36 + 33/36 + 11/36 = 89/36 cm

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