упроситите выражение: 1)-5(0,9m-1,1n)-1,5m+1,9n 2)5/8x-1/4x-1/12x+1/6x 3)5/7y+1/4y+3/14y+одна целая три четвертых 4)три целых три

1) - 5 (0,9m - 1,1n) - 1,5m + 1,9n = - 5 * 0.9m + 5 * 1.1n - 1,5m + 1,9n = - 4.5m + 5.5n - 1.5m + 1.9n = m (- 4.5 - 1.5) + n (5.5 + 1.9) = - 6m + 7.4n.

2) 5/8x - 1/4x - 1/12x + 1/6x = x ((5 * 3)/24 - 6/24 - 2/24 + 4/24) = x (15/24 - 6/24 - 2/24 + 4/24) = x (15 - 6 - 2 + 4)/24 = 11/24x.

3) 5/7y + 1/4y + 3/14y + 1 3/4 = y (5/7 + 1/4 + 3/14) + 1 3/4 = y ((5 * 4)/28 + 7/28 + 6/28) + 1 3/4 = y (20/28 + 7/28 + 6/28) + 1 3/4 = y (20 + 7 + 6)/24 + 1 3/4 = 33/24y + 1 3/4 = 1 3/8y + 1 3/4.

4) 3 3/5x + 4 10/21 + 1 1/2x + 2 1/3 = x (3 3/5 + 1 1/2) + 4 10/21 + 2 1/3 = x ((3 * 5 + 3)/5 + (1 * 2 + 1)/2) + (4 * 21 + 10)/21 + (2 * 3 + 1)/3 = x (18/5 + 3/2) + 94/21 + 7/3 = x ((18 * 2)/10 +(3 * 5)/10) + 94/21 + (7 * 7)/21 = x (36/10 + 15/10) + 94/21 + 49/21 = x (36 + 15)/10 + (94 + 49)/21 = 5.1x + 143/21 = 5.1x + 6 17/21.