va rog dau coroana multumesc la 5 numa ceu

=(1-0,4:0,8+3:1,2) : [(2,6-7/3.42/49).10/7]+{[4:(2-0,4)+1]:[7-2:(1-2/3)]}=

=(1-4/10.10/8+3.10/12) : [(26/10-7/3.42/49).10/7] + {[4:1,6 + 1] : [7-2:1/3)]}=

=(1-40/80+30/12):[(26/10-294/147).10/7]+[(4.10/16+1):(7-6)=

=(1-1/2+5/2):[(13/5-98/49).10/7]+(40/16+1):1=

=7/2:[(13/5-2).10/7]+56/16=

=7/2 :( 3/5.10/7)+7/2=

=7/2:30/35+7/2=

=7/2.7/6+7/2=

=49/12+7/2=

=49/12+42/12=

=91/12