问题
选择题
在数轴上把数2对应的点移动3个单位后所得的对应点表示的数是（ ）
A．5
B．-1
C．5或-1
D．不确定
答案
若把数2对应的点向右移动3个单位后所得的对应点表示的数是2+3=5；
若向左移动3个单位后所得的对应点表示的数是2-3=-1．
故选C．
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在数轴上把数2对应的点移动3个单位后所得的对应点表示的数是（ ）
A．5
B．-1
C．5或-1
D．不确定
若把数2对应的点向右移动3个单位后所得的对应点表示的数是2+3=5；
若向左移动3个单位后所得的对应点表示的数是2-3=-1．
故选C．
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