问题
选择题
已知线段AB＝5 cm，在直线AB上画线段BC＝2 cm，则AC的长是（ ）．
A．3 cm
B．7 cm
C．3 cm或7 cm
D．无法确定
答案
C
解：∵在直线AB上画线段BC，
∴AC的长度有两种可能：
①当C在AB之间，
此时AC=AB-BC=5-2=3cm；
②当C在线段AB的延长线上，
此时AC=AB+BC=5+2=7cm．
故选C．
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已知线段AB＝5 cm，在直线AB上画线段BC＝2 cm，则AC的长是（ ）．
A．3 cm
B．7 cm
C．3 cm或7 cm
D．无法确定
C
解：∵在直线AB上画线段BC，
∴AC的长度有两种可能：
①当C在AB之间，
此时AC=AB-BC=5-2=3cm；
②当C在线段AB的延长线上，
此时AC=AB+BC=5+2=7cm．
故选C．
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