Desfaceti parantezele:
a)[tex](2a- \sqrt{3} )( a^{2} +3a- \sqrt{3} )[/tex]
b)[tex](a-b)( a^{2} +ab+ b^{2} )[/tex]
c)[tex](b-2 b^{2}+1)(1-b)[/tex]
d)[tex]( x^{2} +2xy+ y^{2} )(x-y)[/tex]