题目内容
如图,已知AB=2,点D是AB的中点,点C在直线AB上,且2BC=3AB.
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(1)补全图形;
(2)求CD的长.
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(1)补全图形;
(2)求CD的长.
(1)如图:点C在线段AB的延长线上(图1),点C在线段AB的反向延长线上(图2),
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(2)∵AB=2,D是AB的中点,
∴AD=DB=
AB=1.
∵2BC=3AB,
∴BC=3.
当点C在线段AB的延长线上时(如图1),
CD=DB+BC=4.
当点C在线段BA的延长线上时(如图2),
CD=CB-DB=2.
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(2)∵AB=2,D是AB的中点,
∴AD=DB=
1 |
2 |
∵2BC=3AB,
∴BC=3.
当点C在线段AB的延长线上时(如图1),
CD=DB+BC=4.
当点C在线段BA的延长线上时(如图2),
CD=CB-DB=2.
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