配套习题- 平行线中“M”型问题如何求角度 -【青果学院】

1/5单选题

难度：

1.

如图，已知直线a∥b，∠1=40°，∠2=60°. 则∠3等于（　　）

A	100°
B	60°
C	40°
D	20°

提示1：: 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

正确答案：QQ==

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

2/5单选题

难度：

2.

如图，AB∥CD，下列结论中正确的是（　　）

A	∠A+∠E+∠C=180°
B	∠A+∠E+∠C=360°
C	∠A+∠C=2∠E
D	∠A+∠C=∠E

提示1：: <p>首先过点E作AB的平行线EF，由AB∥CD，可得AB∥EF∥CD</p><p><img height="auto" width="auto" alt="" data-cke-saved-src="data:image/png;base64,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" src="data:image/png;base64,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"></p>

正确答案：RA==

<div>解：过点E作EF∥AB，<br>∵AB∥CD，<br>∴AB∥EF∥CD，<br>∴∠A=∠AEF，∠C=∠CEF，<br>∴∠AEC=∠AEF+∠CEF=∠A+∠C.<br>故选D.</div><div><img height="auto" width="auto" alt="" 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3/5单选题

难度：

3.

如图，AB∥CD，∠A+∠E=75°，则∠C为（　　）

A	60°
B	65°
C	75°
D	80°

正确答案：Qw==

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

4/5单选题

难度：

4.

是赛车跑道的一段示意图，其中AB∥DE，测得∠B=140°，∠D=120°，则∠C的度数为（　　）

A	120°
B	100°
C	140°
D	90°

正确答案：Qg==

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

5/5单选题

难度：

5.

如图，已知直线AB∥CD，当点E在直线AB与CD之间时，有∠BED=∠ABE+∠CDE成立；而当点E在直线AB与CD之外时，下列关系式成立的是（　　）

A	∠BED=∠ABE+∠CDE或∠BED=∠ABE-∠CDE
B	∠BED=∠ABE-∠CDE
C	∠BED=∠CDE-∠ABE或∠BED=∠ABE-∠CDE
D	∠BED=∠CDE-∠ABE

正确答案：Qw==

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