Вычислите:
а) 7 * 55 + 7 * 45 + 3 * 45 + 3 * 55;
б) 8 * 2 + 2 * 92 + 8 * 98 + 2 * 8;
в) 37 * 59 + 37 * 41 + 63 * 59 + 41 * 63;
г) 356 * 73 + 644 * 27 + 73 * 644 + 27 * 356.
7 * 55 + 7 * 45 + 3 * 45 + 3 * 55 = 7 * (55 + 45) + 3 * (45 + 55) = 7 * 100 + 3 * 100 = 100 * (7 + 3) = 100 * 10 = 1000
8 * 2 + 2 * 92 + 8 * 98 + 2 * 8 = 2 * (8 + 92) + 8 * (98 + 2) = 2 * 100 + 8 * 100 = 100 * (2 + 8) = 100 * 10 = 1000
37 * 59 + 37 * 41 + 63 * 59 + 41 * 63 = 37 * (59 + 41) + 63 * (59 + 41) = 37 * 100 + 63 * 100 = 100 * (37 + 63) = 100 * 100 = 10000
356 * 73 + 644 * 27 + 73 * 644 + 27 * 356 = 73 * (356 + 644) + 27 * (644 + 356) = 73 * 1000 + 27 * 1000 = 1000 * (73 + 27) = 1000 * 100 = 100000