If x is an even integer and y is an odd integer, which of the following is even?
3x + 4y - 1
3x + 3y - 2
4x + 4y + 1
4x + 3y + 2
4x + 3y + 1
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+1因为紧迫感,将正确答案的选项混淆,也没check!
+1因为紧迫感,将正确答案的选项混淆,也没check!
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