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(3+ pier. z 3)(3- pier. z 3)=9-3
5(pier. z 5 +3)=5pierw. z 5 +15
(pier. z 5 -3)(pier. z 5 +3)=25-9
---------=mnożymy licznik i mianownik przez 3-√3
3+√3
1(3-√3)
=--------------- =
(3+√3)(3-√3)
3-√3
=-----------------------
9-3
3-√3
=---------------
6
b)
5
-------=
√5-3
5( √5-3 )
----------------=
( √5-3 )( √5+3 )
5√5-15
-------------=
5-9
5√5-15
-------------
-4
---------=mnożymy licznik i mianownik przez 3-√3
3+√3
1(3-√3)
=--------------- =
(3+√3)(3-√3)
3-√3
=-----------------------
9-3
3-√3
=---------------
6
b)
5
-------=
√5-3
5( √5-3 )
----------------=
( √5-3 )( √5+3 )
5√5-15
-------------=
5-9
5√5-15
-------------
-4