Respostas

2014-03-10T01:14:37-03:00
Calcule :
a)√2 . ( √3 - √6 ) =
    √6-√12

b)√7 . ( √7 + √2 ) =
      7+√14

c) ( √2 -√6 ) . ( √2 + 2√6 ) =
       2+2√12-√12-12=-10+√2

d) ( √5 - √7 ) . ( 5 + √7 ) =
5
√5+√35-5√7-7=
2 5 2