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4,5 * 5 5/9 + 6,4 * 3/8 = 45/10 * 50/9 + 64/10 * 3/8 = 9/2 * 50/9 + 32/5 * 3/8 =
= 50/2 + 4/5 * 3 = 25 + 12/5 = 25 + 2 2/5 = 27 2/5 = 27,4