If is given that N is an integer.Prove that (a) 3(2N-1)+1 is an even number.
问题描述：
If is given that N is an integer.Prove that (a) 3(2N-1)+1 is an even number.
答
on9仔等我答你,3(2N-1)+1既解咪系3(2N-1)+1既答案LO SB~!