1) (х/2 + у/3) * 6 = (4/2 + (- 1/3)) * 6 = (4/2 - 1/3) * 6 = (2 - 1/3) * 6 = (1 3/3 - 1/3) * 6 = 1 2/3 * 6 = 5/3 * 6/1 = 5/1 * 2/1 = 10
2) (х/4 - у/12) * 12 = (- 2/4 - 3/12) * 12 = (- 2/4 - 1/4) * 12 = - 3/4 * 12 = - 9
3) (2х/3 + у/5) * 3 = (2*1/3 + 2/5) * 3 = (2/3 + 2/5) * 3 = (10/15 + 6/15) * 3 = 16/15 * 3/1 = 16/5 = 3 1/5
4) (5х/6 - 3у/8) * 4 = (5 * 6/6 - 3 * 2/8) * 4 = (30/6 - 6/8) * 4 = (5 - 6/8) * 4 = (4 8/8 - 6/8) * 4 = 4 2/8 * 4 = 4 1/4 * 4 = 17/4 * 4/1 = 17