Răspunsuri

2014-10-22T19:11:29+03:00
A.  I.    1/11(2/13 +1/5 -3/7) = 1/11 ·(2·5·7+13·7 -3·13·5)/(13·5·7)=
=1/11 ·(-4)/455 =-4/5005
II.  2/(11·13) + 1/(11·5) - 3/(11·7) = (70 + 91 - 165)/(5·7·13·11) =
- 4/5005
B.  1/5(3/17 - 13/27) = 1/5 ·(3·27-13·17)/(17·27) =1/5 ·(-140)/459
= - 28/459