👤

exercițiul 5 punctul c) . Urgent! ! !

Exercițiul 5 Punctul C Urgent class=

Răspuns :

S=1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)+1/(10x11)+1/(11x12)

42=2x3x7
56=7x2³
72=2³x3²
90=3²x2x5
110=2x5x11
132=11x3x2²
[42,56,72,90,110,132]=2³x3²x5x7x11=27720
S=(660+495+385+308+252+210)/27720=2310/27720=231/2772=2310,08(3)