Respostas

2014-07-28T16:11:00-03:00
(2-2√2)/(2-√2)=
((2-2√2)/(2-√2))*((2+√2)/(2+√2))=
(4+2√2-4√2-4)/(4+2√2-2√2-2)=
(4-4+2√2-4√2)/(4-2+2√2-2√2)=
(0-2√2)/(2+0)=
(-2√2)/2=
-√2