Question

Stabiliti valoarea de adevar a propozitiilor:
a) $\sqrt{ ( \sqrt{5-2)} ^{2} } =2- \sqrt{5}$
b)$\sqrt{3 \sqrt{3}- \sqrt{2} }* \sqrt{3 \sqrt{3}+ \sqrt{2} } apartine Q$
c)$( \sqrt{3} +1)* \sqrt{4-2 \sqrt{2} } apartine R- Q$

Answer 1

a. √√3² = √√9= √3  fals 
b.  rad [ (3√3)² - (√2)² ] =  rad[ 27 -2 ] = √25 = 5 ∈ Q  adevarat 
c. adevarat