多选题If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)AxyB(x+1)yCx(y+1)
多选题
If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)
A
xy
B
(x+1)y
C
x(y+1)
参考解析
解析：
由于题目中x和y是变量，可以根据题干给出的条件给x, y设定符合条件的数值，代入各选项，看结果是否符合题干要求，即可得出答案。
由于题目中x和y是变量，可以根据题干给出的条件给x, y设定符合条件的数值，代入各选项，看结果是否符合题干要求，即可得出答案。
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