(60 + 1) * 7 = 427
(17 − 13) * 5 = 20
(67 − 17) * 4 = 200
(30 − 2) * 5 = 140
Вычисления:
(60 + 1) * 7 = 60 * 7 + 1* 7 = 6 * 7 * 10+ 1* 7 = 42 * 10 + 7 = 420 + 7 = 427
(17 − 13) * 5 = 4 * 5 = 20
(67 − 17) * 4 = 50 * 4 = 5 * 4 * 10 = 20 * 10 = 200
(30 − 2) * 5 = 30 * 5 − 2 * 5 = 3 * 5 * 10 − 2 * 5 = 15 * 10 − 10 = 150 − 10 = 140