247. Обчисли: 1) 5) 2/9 + 3/5 6/7 - 2/3 2) 6) 4/9 + 1/6 11/12 - 5/6 3) 7) 1/18 + 5/12 7/12 - 3/8 4) 8) 3/.10 + 2/15 9/14 - 17/35. срочно,даю 35 балов
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