Ответы на вопрос:
3/5: (1/2: 3/4-4/9): 3/5= 3/5 / (1/2* 4/3 - 4/9) / 3/5 = 4/6 - 4/9 = 12/18- 8/18 = 4/18 = 2 /9 3/5: 9/10-3/5*8/9 =3/5 * 10/9 - 3/5 * 8/9 = 30/45 - 24/45 = 6/45
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