4.
2^3+2^10/2^8*2+2*2^7/2^5+2^10/(3*2^5+2^5)-4*2^3=
2^3+2^3(10-8+1)+2^3(1+7-5)+2^10/[2^5(3+1)]-2^2*2^3=
2^3+2^3+2^3+2^10/2^7(5+2)-2^5=
2^3(1+1+1+1-2^2)=
2^3(4-4)=
2^3*0=0
5.
[2^2*2^4+(1+5)^2]*[14^2/(30^2/15^2)/7-18^3/9^3/4]-2^2*10^2=
(2^6+1+10+25)*[7^2*2^2/(2^2*15^/15^2)/7-2^3*9^3/9^3/2^2]-2^2*2^2*5^2=
(2^6+6^2)*(7^2*2^2/2^2*7-2)-2^4*5^2=
(2^6+6^2)*(7^3-2)-2^4*5^2=
nu mai fac de aici ca nu iese nimic, dar poate ai prins ideea si o sa te descurci
:))
