1.
Let f:RRf: \mathbb{R} \to \mathbb{R} be a function defined by f(x)=(2+3a)x2+(a+2)x+bf(x) = (2+3a)x^2 + (a+2)x + b, a1a \neq 1. If f(x+y)=f(x)+f(y)+112xyf(x+y) = f(x) + f(y) + 1 - \frac{1}{2}xy, then the value of 28r=110f(r)28\sum_{r=1}^{10} f(r) is: