Question

Determinati elementele urmatoarelor multimi:
A={x bara x apartine N,2x+5=7}
C={a bara a apartine N,3^a mai mic sau egal cu 81}
E={x bara x apartine N,x=2n-n^2,n apartine N}
F={x bara x apartine N,100 mai mic sau egal cu x<200,x patrat perfect}
G={a bara a apartine N,a=2n-1,n apartine{1,3,5,7}}
H={a bara a apartine N,a=3x+2y,x apartine{0,1},y apartine{2,3}}
B={x bara x apartine N,4x+1=6}
D={a bara a apartine N,a=2^n,n mai mic sau egal cu 4,n=N.
VA ROG RASPUNSUL REPEDEEEEEEEE!!!!!!!!!!!!!

Answer 1

a=1
b=2
si tot asa daca stii

Answer 2

A= x=1
C= A mai mic sau egal cu 27
E= x=0
F= pot sa fie mai multe variante : 12 ,13,14 la patrat
G= cand n=1 => 2*1-1=1 cand n=3=>2*3-1=5 cand n=5=>2*5-1=9 cand n=7=>2*7-1=13
H=cand x=0 si y=2=> 3*0+2*2=4 cand x=0 si y=3=>3*0+2*3=6 cand x=1 si y=2=>3*1+2*2=7 cand x=1 si y=3=>3*1+2*3=9
B=x= 5 pe 4
D= cand n=0=>a= 2*0 =0 cand n=1=>2*1=2 cand n=2=>2*2=4  cand n=3 2*3=6 cand n=4 =>2*4=8