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  3. Which of the following is an equation of a line that does NOT contain any points in the xy-plane whose both coordinates are inte

Which of the following is an equation of a line that does NOT contain any points in the xy-plane whose both coordinates are inte

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问题 Which of the following is an equation of a line that does NOT contain any points in the xy-plane whose both coordinates are integers?
选项 A、y=4
B、y=x/2
C、y=x+3
D、y=x+1/2
E、y=x/2+3
答案D
解析 本题可使用举反例法解答。A选项：(0，4)，B选项：(0，0)，C选项：(0，3)，E选项：(0，3)，故答案为D。
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