Respostas

2014-03-15T23:48:27-03:00
a) √28 + √63 = √4.7 + √9.7 = 2√7 + 3√7 = 5√7

b) √75 - √3 = √25.3 - √3 = 5√3 - √3 = 4√3

c)√27 + √117 = √9.3 + √9.13 = 3√3 + 3√13 = 3.(√3 + √13)

d) √20 -√8 = √4.5 - √4.2 = 2√5 - 2√2 = 2.(√5 - √2)

e) √20 +√125 = √4.5 + √25.5 = 2√5 + 5√5 = 7√5

f) √1000 - √10
= √100.10 - √10 = 10√10 - √10 = 9√10
5 3 5