????:1?????????????:???????

2????????

3???600??????

4?????????100

5?????????

??10????????????19????? ?(ABC)?????,???10??18?,?????,????10??,????

???,????????18???????1???30??,?????????????????(??1.61?)???,?????????????13???????(??5.26???)?

????,????????500?????

??????,?,?????? ???????????:????