Выражения а)4m-6m-3m+7+m б)-8(k-3)+4(k-2)-2(3k+1) в)5/9(3,6a-3 3/5 b)-3,5(4/7 a-0,2 b)

А)4m-6m-3m+7+m = 3m

б)-8(k-3)+4 (k-2)-2(3k+1) = -8k + 24 +4k - 8 -6k - 2 = -10k + 14

в)5/9(3,6a-3 3/5b)-3,5 (4/7a-0,2b) = 5/9*3,6a - 5/9*18/5b - 3,5*4/7a + 3,5*0,2b = = 2a - 2b - 2a + 0,7b = - 1,3b