Question

-3/5 -{-2/3+[(3/4-2/5)-(4/5-7/4) ]-7/5} si cu rezolvarea va rog urgent dau coroana

Answer 1

-3/5 -{-2/3+[(3/4-2/5)-(4/5-7/4) ]-7/5} =
= - 3/5 - { - 2/3 + [ (15/20 - 8/20) - ( 16/20 - 35/20)]-7/5}=
= - 3/5 - [ -2/3 + (7/20 + 19/20) - 7/5]=
= - 3/5 - ( -2/3 + 26/20 - 7/5)=
= - 3/5 - ( - 40/60 +78/60 - 84/60) =
= -3/5 + 46/60=
= - 3/5 + 23/30 =
= - 18/30 +23/30=
= 5/30=
=1/6