Ответы на вопрос:
7/9 * 81 = 7 * 9 = 63 70 * (45/100) = 70 * 0.45 = 31.5 45 * 9/5 = 9 * 9 = 81 5x - 10 - x +1 = 9 4x - 9 = 9 4x = 9 + 9 4x = 18 x = 4.5
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