S = 46,7 * 2,6 = 121,42 ( m2 )
х-2/х+2 = х+3/х-4
х-2/х+2 = х+3/х-4 , х не равно -2 , х не равно 4
(х-2)*(х-4) = (х+3)*(х+2)
х^2-4х-2х+8 = х^2+2х+3х+6
-4х-2х+8 = 2х+3х+6
-6х+8 = 5х+6
-6х-5х = 6-8
-11х = -2
х= 2/11 , х не равно -2 , х не равно -4
ОТВЕТ: х = 2/11
A13.
= sgrt*(2005- 1) = sgrt2004;
A14.
(7+sgrt39) - (7-sgrt39) /((7-sgrt39)(7+sgrt39) =
=(7 + sgrt39 7 + sgrt39) /(7^2 - 39) = (2sgrt39) / 10 =
= sgrt39 / 5