Răspunsuri

Cel mai inteligent răspuns!
2014-09-03T23:13:40+03:00
1) √( 7-4√3)= √(7-√48)

A=7
B=48
C²=49-48=1  

√(7-√48)= √(7+1)/2 - √(7-1)/2= √8/2 - √6/2=  √4 -√3=  2-√3

ma= (2-√3+2+√3)/2=  4/2=2

mg= √ab=  √(2-√3)(2+√3)=  √4-3=1

2) 1/4 + 2/4 + 3/4+...+ 100/4=

=[(1+100)*100/2 ]/4=

= (101*50)/4=

=101* 25/2=

=2525/2=  1262,5
Multumesc mult! Dar imi zici te rog la ex 2. de ce e *100/2 ?
Este formula n(n+1)/2