(4/5 - 2/3 : 7/15) - 3/2 =

7/3 ( 1/2 + 1/4) + 1/2 - 5 =

5 ( 2/4 + 1/3) : (-2) =

( 1/3 - 5/3 - 1/4) (-3) =

 

plissss