____和____是慧骃马族的两大美德。

   Every year people celebrate the Spring Festival in China. Usually it is in January or February. It's the most important(重要的) festival in China. So before it comes, everyone buys many things, and they often make a special kind of food called dumplings. It means “come together”. Parents always buy new clothes for their children and children also buy presents for their parents. On the Spring Festival eve(除夕), all the family members come back home. They sing, dance and play cards. When they enjoy the meal, they give each other the best wishes(祝愿) for the coming year. They all have a good time.

对于实数a和b，定义运算“*”：$a*b=\left\{\begin{array}{c}{a}^2-ab,a\le b\\ b^2-ab,a>b\end{array}\right.$,设f(x)=(2x-1)*(x-1)，且关于x的方程f(x)=a(a$\in R$)恰有三个互不相等的实数根，则实数a的取值范围是(   )