Question

1) Fie A ={ 0;-4;25,-64;0,36;0,4;3(27);6}. Determinati multimea 
B={x∈Q | $x^{2}$∈A.
2)A= { √ 12;-$- \frac{ \sqrt{2} }{ \sqrt{3} } ; \sqrt{ 3\frac{1}{5} } ;(- \sqrt{2)} ^{-1} ;- \sqrt{7} ; \sqrt{0,(3) }.}$
Stabiliti valoloarea de adevar a propozitiilor :
a) A inclus R 
b) A inclus ( R-Q)
c) A inclus Q

Answer 1

1)
B = P{0;  5;  0,6}

2)
a) Adevarat
b) Adevarat
c) Fals