35. 已知二次函数f(x)=−3x2+2(a−1)x+2f(x)=-3x^{2}+2(a-1)x+2f(x)=−3x2+2(a−1)x+2，且对任意的x1x_{1}x1，x2∈(−1,+∞)x_{2}\in (-1,+\infty )x2∈(−1,+∞)都有(x1−x2)(f(x1)−f(x2))<0(x_{1}-x_{2})(f(x_{1})-f(x_{2}))<0(x1−x2)(f(x1)−f(x2))<0恒成立，则实数aaa的取值范围为((( )))