Contact us
Choose a category below so we can get back to you as quickly as possible.
因為2x肯定是偶數,偶數+a=100(偶數) 所以a只能是偶數; 3y要是偶數,只有y是偶數才能保證3y是偶數; 所以y是偶數
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.