Răspunsuri

2014-08-04T15:21:17+03:00
12/3√3=12√3/9 = 4√3/3 . 

21/√14 = 21√14/14 = 3√14/2 . 

-28/4√7=-7/√7=-7√7/7=-√7 . 

√2/√3=√6/3

√6/2√2=√12/4= 2√3/4=√3/2 . 

5√3/4√5=5√15/20 = √15/4 . 
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2014-08-04T15:25:57+03:00
A) 12/3√3=  4/√3=  4√3/3

b)21/√14=   21√14/14=  3√14/2

c)-28/4√7=  -7/√7=  -7√7/7=  -√7

d)√2/√3=  √6/3

e)√6/2√2=  √12/2*2=  2√3/2*2=  √3/2

f)5√3/4√5=   5√15/4*5=  √15/4
3 4 3