Решаем в скобках (2.5+11/3)=2.5/10+11/3=2.1/2+11/3=Знаменатель=2.3/6+1.2/6=3.5/6-2=3.5/6:1/3=Дробь=(6*3+5)/6:1/3=23/2=11.1/2=5.4/7=5 8/14-11 7/14= -5 13/14 - Ответ
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....................................= - 5 13/141) 2,5+1 1/3=2 1/2+1 1/3=2 3/6+1 2/6=3 5/6
2) 3 5/6 : 1/3=23/6 * 3=23/2=11 1/2
3) 5 4/7 - 11 1/2=5 8/14 - 11 7/14= - 5 13/14
Решаем в скобках (2.5+11/3)=2.5/10+11/3=2.1/2+11/3=Знаменатель=2.3/6+1.2/6=3.5/6-2=3.5/6:1/3=Дробь=(6*3+5)/6:1/3=23/2=11.1/2=5.4/7=5 8/14-11 7/14= -5 13/14 - Ответ