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【323419】2023九年级数学上册 第3章 图形的相似3.2 平行线分线段成比例同步测试题 (新版

时间:2025-01-16 18:33:06 作者: 字数:2432字
简介:


3.2 平行线分线段成比例


1.如图,已知l1l2l3,若AB1BC2DE1.5,则EF的长为(   )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

A1.5 B2 C2.5 D3

2.如图,已知直线abc,直线mn与直线abc分别交于点ACEBDFAC4CE6BD3,则BF(   )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

A7 B7.5 C8 D8.5

3.如图,已知ABCDEF,那么下列结论正确的是(   )

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A. B.

C. D.

4.如图,ABCDEF,则下列结论不正确的是(   )

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A. B.

C. D.

5.如图,已知abc,若ABBC,则DE_______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

6.如图,已知ADBECFBC3DEEF2∶1,则AC______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

7.如图,如果l1l2l3AC12DE3EF5,那么BC_______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

8.如图,在△ABC中,DEBCAB于点D,交AC于点E,下列不能成立的比例式一定是(   )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

A. B.

C. D.

9.如图,在△ABC中,点DE分别在边ABAC上,DEBC,已知AE6,=,则EC的长是(   )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

A4.5 B8

C10.5 D14

10.如图,若DEBCAD3 cmDB2 cmAC10 cm,求AE的长.

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

13.如图,直线l1l2l3,另两条直线分别交l1l2l3于点ABC及点DEF,且AB3DE4EF2,则(   )

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

ABCDE1∶2 BBCDE2∶3

CBC·DE8 DBC·DE6

14.如图,直线A1ABB1CC1,若AB8BC4A1B16,则线段B1C1的长是______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

15.如图,已知ABCDEFACCE2∶3BF15,那么BD______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

16.如图,直线CDEF,若OC3CE4,则的值是_______

 <a href="/tags/4/" title="测试" class="c1" target="_blank">测试</a> <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/50/" title="同步" class="c1" target="_blank">同步</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/58/" title="平行" class="c1" target="_blank">平行</a>

18.如图,已知ABMNBCNG,求证:=.

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19.已知:如图,在△ABC中,DEBCEFAB,试判断=成立吗?并说明理由.

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答案:

1---4 DBAC

5. EF

6. 9

7. 7.5

8. D

9. B

10. 解:6 cm

11. A

12. A

13. D

14. 3

15. 6

16.

17. 解:根据题意有=AD2 cmEC2 cmACAEEC3 cm 

18. 解:∵AB∥MN.又∵BC∥NG= 

19. 解:=成立.理由如下:∵DE∥BC.∵EF∥AB.∴= 









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