2/9 : ( 1/5 - 1/6 ) = 1/5 - 1/6 = 6/30 - 5/30 = 1/30 = 2/9 : 1/30 = 2*30/9*1 = 60/9 = 6 6/9

-7 + 15 - 40 = - 47 + 15 = - 32

- 4 * 0,3 - 5,82 = - 7,02