Удобным способом ( или распределительный закон ) 5 класс
а)12 * 17 + 35 * 13 + 17 * 28 + 65 * 13 =
б)41 * 80 - 25 * 41 + 55 *29 + 45 * 29 =
в)26 * 18 + 14 * 35 + 18 * 74 + 86 * 35 =
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