Question

efectuati:

[tex]a)( \frac{2 \sqrt{5+1} }{5} + \frac{2 \sqrt{3} -1}{3} ):( \frac{1}{3} - \frac{1}{5} - \frac{2} { \sqrt{3} } - \frac{2}{ \sqrt{5} } );


[/tex]

Answer 1

[(2√5+1)/5+(2√3-1)/3]:(1/3-1/5-2/√3-2/√5)=
=(6√5+3+10√3-5)/15  :(1/3-1/5-2√3/3-2√5/5)=
=(6√5+10√3-2)/15  :(5-3-10√3-6√5)/15=
=(6√5+10√3-2)/15  ×15/(2-10√3-6√5)=
=(6√5+10√3-2)/(2-10√3-6√5)=
=(6√5+10√3-2)/[-(6√5+10√3-2)]=-1