世界上没有绝对的公平，公平是相对的。（  ）

计算： $3\sqrt{5}-2\sqrt{5}$ =____．

（2015•莱芜）一个多边形除一个内角外其余内角的和为1510°，则这个多边形对角线的条数是（　　）

     My name is Danny. I'm from England. I am eleven. I'm tall with black hair. I have two big eyes. My fax number is 010-74862635.

     (Hello! I am Jane. I'm from the USA. I have a round face and two big eyes. I'm short and thin. I'm twelve. My parents work in Beijing.

    Look at the photo. Who's the girl in it? It's me, an English girl. My name is Amy.

    I'm in Grade Seven. I'm twelve. My home phone number is 022-43765986. I have a round face and long, black hair. I like Chinese very much, and I'm very good at it.

    Who am I? I'm from Japan. My name is Yukio. I'm thirteen. Now I'm in Beijing. I'm short, and I'm very heavy(重的). I have two short legs.