Question

Exercițiul 3, de la punctul,,a" până la ,,h".
Mulțumesc!

Answer 1

a) 3x=12 => c=12/3=4∈Z ;  b) -3x=1 => x= - 1/3 ∈ Q ; c)x+2=1 => x= -1∉N ;

d) x-4 = 1/2 => x=4+1/2= 9/2∈Q ; e) 4/3 x = 5 => x=5 :4/3 = 5* 3/4 = 15/4 ∈Q ;

f) 5/6 y = 1 => y = 1* 6/5 = 6/5∈Q ; g) -1=2/3 t => t=-1*3/2 = - 3/2∈Q ;

h0 -4/7 y = 8 => y = 8*(-7/4) = - 14∈Z ;