Объяснение:
1) 2/3 + 7/9 + 11/18 = 12/18 + 14/18 + 11/18 = 37/18 = 2 1/18
2) 8/15 - 2/5 + 9/15 = 8/15 - 6/15 + 9/15 = 11/15
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Объяснение:
1) 2/3 + 7/9 + 11/18 = 12/18 + 14/18 + 11/18 = 37/18 = 2 1/18
2) 8/15 - 2/5 + 9/15 = 8/15 - 6/15 + 9/15 = 11/15