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8 2/11*(4 3/4 * 4/57 + 7 2/3 * 9/46) + 15 *(5 7/8 * 3 3/47 — 3 2/3 * 31/55)
8 2/11*(4 3/4 * 4/57 + 7 2/3 * 9/46) + 15 *(5 7/8 * 3 3/47 — 3 2/3 * 31/55)
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8 2/11 * (4 3/4 * 4/57 + 7 2/3 * 9/46) + 15 * (5 7/8 * 3 3/47 - 3 2/3 * 31/55) = 90/11 * (19/4 * 4/57 + 23/3 * 9/46) + 15(47/8 * 3 * 3/47 - 11/3 * 31/55) = 90/11 * (1/3 + 3/2) + 15(1/8 * 3 * 3 - 1/3 * 31/5) = 90/11 * 11/6 + 15(9/8 - 31/15) = 15 + 15 * (-113/120) = 15 - 113/8 = 7/8
Ответ: 7/8