Contact us
Choose a category below so we can get back to you as quickly as possible.
三位數用abc表示為100a+10b+c 能被2整除,個位數必須為0或偶數 能被5整除,個位數必須為0或5 故判定個位數為0,即c=0 則由a+c=8得a=8 能被3整除則a+b+c能被3整除 即8+b能被3整除 則b應該是1、4、7當中的1個 所以這個數位為 810 840 870
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.