Question

ajutati-ma va rog dau coroana.

Answer 1

1. a) 7 , ca are 7 elemente
 {0;√4;7} naturale
 {-3;0;√4; 7} intregi
{-3;0;√4; 5,(4);7} rationale
obs. se vede ca relatia N ⊂Z⊂ Q este verificata de solutiile noastre
de asemenea se e calculeaza √4=2∈N⊂Z⊂Q

 -3;0; /π-4/;√4;√5;5,(4);7

d) [18/(-27)-(1/49)*(49/9)](x-1)=√4+2x

   [-2/3-1/9](x-1)=√4+2x
 [-6/9-1/9](x-1)=√4+2x

7/9* (1-x)=√4+2x

7/9-7x/9=√4+2x

7/9-√4=2x+7x/9
(7-9√4)9=25x/9
7-9√4=25x
  
x=(7-9√4)/25

E=/√5-√3/+/√3-√4/ +√5 +√4+2√5-4

√5-√3+2-√3 +√5+2+2√5-4=

=4√5-2√3

1/E=1/(4√5-2√3) =(4√5+2√3)/(16*5-4*3)=

(4√5+2√3)/68=(2√5+√3)/34