2 a + 7*a + 10
a^2 + 7*a + 10 при a = 1/3
a^2 + 7*a + 10
(1/3)^2 + 7*(1/3) + 10
(1/3)^2 + 7/3 + 10
112/9
10.0 + a^2 + 7.0*a
10 + a*(7 + a)
(2 + a)*(5 + a)