Ответы на вопрос:
1) m - 5/12m = 1/4 : 0,75 * 3 7/12m = 1/4 : 3/4 * 3 7/12m = 1/4 * 4/3 * 3 7/12m = 1*4*3 / 4*3 7/12m = 12/12 m = 12/12 : 7/12 m = 12/12 * 12/7 m = 12*12 / 12*7 m = 12/7 m = 1 5/7 проверка: 12/7 - 5/12 * 12/7 = 1/4 : 0,75 * 3 12/7 - 5*12 / 12*7 = 1/4 : 3/4 * 3 12/7 - 60/84 = 1/4 * 4/3 * 3 12*12 / 7*12 - 60/84 = 1*4*3 / 4*3 144/84 - 60/84 = 12/12 84/84 = 12/12 1 = 1 2) 5/9х + 5/6х = 1/4 5*2 / 9*2 * х + 5*3 / 6*3 * х = 1/4 10/18х + 15/18х = 1/4 25/18х = 1/4 х = 1/4 : 25/18 х = 1/4 * 18/25 х = 1*18 / 4*25 х = 18/100 х = 9/50 проверка: 5/9 * 9/50 + 5/6 * 9/50 = 1/4 5*9 / 9*50 + 5*9 / 6*50 = 1/4 45/450 + 45/300 = 1/4 1/10 + 9/60 = 1/4 6/60 + 9/60 = 1/4 15/60 = 1/4 1/4 = 1/4
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