阅读短文，回答问题。China is a big country. There is a population of 1.3 billion（13亿人口）in China. People speak Chinese in China. Beijing is the capital ofChina. It`s an old and famous city. It`s in the north .In China, there are manybig cities. Shanghai is a famous city, too. It`s in the east of China. I livein shanghai. My favourite city is Sanya. Sanya is in the south. Lhasa(拉萨)is in the west.

进化树又称“系统树”、“系谱树”，简明地表示了生物的进化历程和亲缘关系．此树从树根到树梢代表地质时间的延伸，主干代表各级共同祖先，大小分枝代表相互关联的各个生物类群的进化线索．请据图分析回答：

设$a\in R$，函数$f\left(x\right)=e^x+a·e^{-x}$的导函数是$f^{\text{'}}\left(x\right)$，且$f^{\text{'}}\left(x\right)$是奇函数。若曲线$y=f\left(x\right)$的一条切线的斜率是$\frac{3}{2}$，则切点的横坐标为（  ）

定义min{a，b}=$\left\{\begin{array}{c}a,a\le b\\ b,b\le a\end{array}\right.$，设函数f（x）=min{2$\sqrt{x}$，|x﹣2|}，若动直线y=m与函数y=f（x）的图象有三个交点，它们的横坐标分别为x₁，x₂，x₃，则x₁+x₂+x₃的取值范围为____