Номер 422
1) 13 * 2a = 26а
2) 9х * 8 = 72х
3) 23 * 4в = 92в
4) 28 * у * 5 = 140у
5) 6а * 8в = 48ав
6) 11х * 14х = 154х
7) 27м * 3n = 81mn
8) 4a * 8 * b * 3 * c = 96abc
9) 12x * 3y * 5z = 180xyz
Номер 427
1) 4 (a + 2) = 4a + 8
2) 3 (m - 5) = 3m - 15
3) (p - q) * 9 = 9p - 9q
4) 12 (a + b) = 12a + 12b
5) 5 (2m - 1) = 10m - 5
6) (3c + 5d) * 14 = 42c + 70d