Ответы на вопрос:
(4.71-8.9) + (8.9-4.71)=4.71-8.9 + 8.9-4.71=0 (6 13/18-4. 7/18 -1.2)=6 13/18-4.2-2 7/18 +1.2=4 6/18-3=1 6/18=1 1/3 (5.9+3..9-3.1)=5.9+3.1-5.9+3.1=6.2 -8 11/13-(2/3-11/13)=-8 11/13-2/3+11/13=-8 -2/3=-8 2/3
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