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11/6 + 12/90
165/90 + 12/90 = 177/90
= 1 87/90 = 1 29/30
d. 5/3 : 5/2 - 3/5 × 9/7
5/3 × 2/5 - 3/5 × 9/7
10/15 - 27/35 = 70/105 + 81/105
= 151/105
= 1 46/105
bilang jika ada yg slah