Calculati: poza o aveti mai in sus
va rog repededau coroana

Răspuns:
(7/9+17/10-1/18) =
(70/90+153/90- 5/90 )
-(13/27-1/18+7/9)
-(26/54+3/54-42/54)
9/90+6/90+10/90
=> (70/90+153/90- 5/90 ) -(13/27-1/18+7/9) +(9/90+6/90+10/90)
218/90-65/54+25/90
243/90-65/54