вычислите удобным способом 1)5,9 + 3 3/7-2,9-2 3/7 2) 4 5/7 -2 8/9 - 10 6/7 +6 1/7 3) 12 14/15-3 4/9 + 5 8/19- 2 7/15 - 34/7
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