Ответ: 1. 54 4/5-39 2/15=54 12/15-39 2/5= 15 10/15=15 2/3
2. 54 4/5+ 15 2/3= 54 12/15+15 10/15=69 22/15= 70 7/15
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Ответ: 1. 54 4/5-39 2/15=54 12/15-39 2/5= 15 10/15=15 2/3
2. 54 4/5+ 15 2/3= 54 12/15+15 10/15=69 22/15= 70 7/15