Пошаговое объяснение:
а) 79 * 9 = (80 - 1) * 9 = 720 - 9 = 711
б) 39 * 9 = (40 - 1) * 9 = 360 - 9 = 351
в) 15 * 61 = 15 * (60 + 1) = 900 + 15 = 915
г) 5 * 52 = 5 * (50 + 2) = 250 + 10 = 260
д) 3 * 901 = 3 * (900 + 1) = 2700 + 3 = 2703
е) 701 * 12 = (700 + 1) * 12 = 8400 + 12 = 8412
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Пошаговое объяснение:
а) 79 * 9 = (80 - 1) * 9 = 720 - 9 = 711
б) 39 * 9 = (40 - 1) * 9 = 360 - 9 = 351
в) 15 * 61 = 15 * (60 + 1) = 900 + 15 = 915
г) 5 * 52 = 5 * (50 + 2) = 250 + 10 = 260
д) 3 * 901 = 3 * (900 + 1) = 2700 + 3 = 2703
е) 701 * 12 = (700 + 1) * 12 = 8400 + 12 = 8412