Ответы и объяснения

2014-04-15T10:25:23+00:00
4/9 * 27/10m - 4/9 * 9/4n - 21/5 * 5/7m + 21/5 * 1/2n =
= 6/5m - n - 3m + 21/10 =
= 1,2m - 3m - n + 2,1 =
= -1,8m + 1,1n = 1,1n - 1,8m