а) 7 * 13 - 7 * 2 = 7(13 - 2) = 7 * 11 = 77
в) 18 * 9 - 18 * 7 = 18(9 - 7) = 18 * 2 = 36
б) 5 * 23 - 5 * 8 = 5(23 - 8) = 5 * 15 = 75
г) 25 * 13 - 25 * 10 = 25(13 - 10) = 23 * 3 = 69
а) 7 * 13 - 7 * 2 = 7(13 - 2) = 7 * 11 = 77
в) 18 * 9 - 18 * 7 = 18(9 - 7) = 18 * 2 = 36
б) 5 * 23 - 5 * 8 = 5(23 - 8) = 5 * 15 = 75
г) 25 * 13 - 25 * 10 = 25(13 - 10) = 23 * 3 = 69