Ответ:1) 10 : 4 - 5 2/5 : 6 = 5/2 - 27/5 : 6 = 5/2 - 27/5×1/6 = 5/2 - 27/30 = 5/2 - 9/10 = 25/10 - 9/10 = 16/10 = 8/5 = 1 3/5 (или = 2,5 - 27/30 = 2,5 - 0,9 = 1,6) 2) (2,3 + 1,9) : 8 = 4,2 : 8 = 0,525
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Ответ:1) 10 : 4 - 5 2/5 : 6 = 5/2 - 27/5 : 6 = 5/2 - 27/5×1/6 = 5/2 - 27/30 = 5/2 - 9/10 = 25/10 - 9/10 = 16/10 = 8/5 = 1 3/5 (или = 2,5 - 27/30 = 2,5 - 0,9 = 1,6) 2) (2,3 + 1,9) : 8 = 4,2 : 8 = 0,525