Ответы и объяснения

2013-01-10T16:50:25+00:00

2 7/9z + 3 1/3 = (1/6 + 6 1/2) х 5/3

25/9z + 10/3 = 5/18z + 65/6

25/9z - 5/18z = 65/6 - 10/3

15/18z = 45/6

z = 6