Răspunsuri

2014-11-12T20:42:16+02:00
A)
√(5 - √2)*(5+√2)= √(25-2)=√23 - (folosim formula de calcul prescurtat (a-b)*(a+b)=a^2-b^2)
b)
√(4-2√3)*(2√3+4)=√(4-2√3)*(4+2√3)=√(16-4*3)=√4=2
c)
√(5-√14)*(5+√14)=√(25-14)=√11.