а) 47 * 42 + 42 * 153 = 42 * (47 + 153) = 42 * 200 = 8 400
б) 57 * 81 - 71 * 57 = 57 * (81 - 71) = 57 * 10 = 570
в) 61 * 45 + 55 * 61 = 61 * (45 + 55) = 61 * 100 = 6 100
г) 39 * 138 - 137 * 39 = 39 * (138 - 137) = 39 * 1 = 39
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а) 47 * 42 + 42 * 153 = 42 * (47 + 153) = 42 * 200 = 8 400
б) 57 * 81 - 71 * 57 = 57 * (81 - 71) = 57 * 10 = 570
в) 61 * 45 + 55 * 61 = 61 * (45 + 55) = 61 * 100 = 6 100
г) 39 * 138 - 137 * 39 = 39 * (138 - 137) = 39 * 1 = 39