Question

ajutor ! imi trebuie pana luni !

Answer 1

(2/3)¹³ :(8/27)⁴ +6×(1-11/18)=
=(2/3)¹³ :(2³/3³)⁴ +6×7/18=
=(2/3)¹³ :(2/3)¹² +7/3=
=2/3 +7/3=
=9/3=3                  raspuns corect 3)

(9/25)^(2n+3)=(27/125)^(n+5)
[(3/5)^2]^(2n+3)=[(3/5)^3]^(n+5)
(3/5)^(4n+6)=(3/5)^(3n+15)
4n+6=3n+15
n=9                    raspuns corect 4)

216=2³ ×3³
nr divizori=(3+1)(3+1)=4×4=16        raspuns corect 1)


(1+1/11+1/111) : (1/5+1/55+1/555)=
=(1+1/11+1/111) : 1/5(1+1/11+1/111)=
=1 :1/5=5                      raspuns corect 2)