2 9 - a a ----- - 18*a + -- + a 81 9
(9 - a)/81 - 18*a + a^2/9 + a при a = 1/2
(9 - a)/81 - 18*a + a^2/9 + a
(9 - (1/2))/81 - 18*(1/2) + (1/2)^2/9 + (1/2)
(9 - 1/2)/81 - 18/2 + (1/2)^2/9 + 1/2
-2711/324
2 1 1378*a a - - ------ + -- 9 81 9
0.111111111111111 + 0.111111111111111*a^2 - 17.0123456790123*a
2 1 1378*a a - - ------ + -- 9 81 9
2 9 - 1378*a + 9*a ----------------- 81
2 1 1378*a a - - ------ + -- 9 81 9
2 a 9 - a a + -- + ----- - 18*a 9 81
2 1 1378*a a - - ------ + -- 9 81 9
2 9 - 1378*a + 9*a ----------------- 81