配套习题- 三角形的中位线定理 -【青果学院】

1/5单选题

难度：

1.如图，△ABC中，D，E分别是边AB，AC的中点．若DE=2，则BC=（　　）

A	2
B	3
C	4
D	5

正确答案：Qw==

6Kej77ya4oi1RO+8jEXliIbliKvmmK/ovrlBQu+8jEFD55qE5Lit54K577yMPGJyPuKItERF5piv4pazQUJD55qE5Lit5L2N57q/77yMPGJyPuKItEJDPTJERT0yw5cyPTTvvI48YnI+5pWF6YCJ77yaQ++8jg==

2/5单选题

难度：

2.如图，∠ACB=90°，D为AB的中点，连接DC并延长到E，使CE=

CD，过点B作BF∥DE，与AE的延长线交于点F．若AB=6，则BF的长为（　　）

A	6
B	7
C	8
D	10

正确答案：Qw==

6Kej77ya5aaC5Zu+77yM4oi14oigQUNCPTkwwrDvvIxE5Li6QULnmoTkuK3ngrnvvIxBQj0277yM4oi0Q0Q9PGltZyB3aWR0aD0xMCBoZWlnaHQ9MzUgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82RC9FNC9yQkFDSmxVX1VxbngzOGNGQUFBQktnVVZiSEU3ODcucG5nIiBhbHQ96Z2S5p6c5a2m6ZmiLWp5ZW9vPkFCPTMg44CC5Y+IQ0U9PGltZyB3aWR0aD04IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZBLzFCL3JCQUNGRlVfVXFud2hRNlJBQUFCSndENUpyUTMzMC5wbmciPkNE77yMPGJyPuKItENFPTHvvIziiLRFRD1DRStDRD0077yO5Y+I4oi1QkbiiKVERe+8jOeCuUTmmK9BQueahOS4reeCue+8jDxicj7iiLRFROaYr+KWs0FGROeahOS4reS9jee6v++8jOKItEJGPTJFRD0477yO5pWF6YCJ77yaQ++8jjxicj48aW1nIHdpZHRoPTEzNSBoZWlnaHQ9MTk0IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNkQvRTQvckJBQ0psVV9VcW1UcGJzZ0FBQWF5bWJJTnAwMjI0LnBuZyI+

3/5单选题

难度：

3.如图，等边△ABC中，点D、E分别为边AB、AC的中点，则∠DEC的度数为（　　）

A	30°
B	60°
C	120°
D	150°

正确答案：Qw==

6Kej77ya4oi1562J6L654pazQUJD77yMPGJyPuKItOinkkPnmoTluqbmlbDmmK82MMKwPGJyPuKItUTjgIFF5YiG5Yir5Li66L65QULjgIFBQ+eahOS4reeCuTxicj7iiLREReKIpUJDPGJyPuKItOKIoEMr4oigREVDPTE4MMKwPGJyPuKItOKIoERFQz0xMjDCsDxicj48aW1nIHdpZHRoPTE0NiBoZWlnaHQ9MTM5IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkEvMUIvckJBQ0ZGVV9VckhqcVBGRUFBQVBCSFRhVjJVOTAyLnBuZyI+

4/5单选题

难度：

4.如图，▱ABCD的对角线AC、BD相交于点O，E是BC边的中点，OE=1．那么AB=（）

A
B	1
C	2
D	4

正确答案：Qw==

6Kej562U77ya4oi15Zub6L655b2iQUJDROaYr+W5s+ihjOWbm+i+ueW9ou+8jDxicj7iiLRPQT1PQ++8mzxicj7lj4jiiLXngrlF5pivQkPnmoTkuK3ngrnvvIw8YnI+4oi0T0XmmK/ilrNBQkPnmoTkuK3kvY3nur/vvIw8YnI+5YiZ5qC55o2u5LiJ6KeS5b2i55qE5Lit5L2N57q/5a6a55CG5Y+v5b6X77yaQUI9Mk9FPTLDlzE9Mu+8jjxicj7mlYXpgIlD77yO

5/5单选题

难度：

5.如图,在△ABC中，E，D，F分别是AB，BC，CA的中点，AB=6，AC=4，则四边形AEDF的周长是

A	10
B	20
C	30
D	40

正确答案：QQ==

6Kej77ya4oi1Re+8jETvvIxG5YiG5Yir5pivQULvvIxCQ++8jENB55qE5Lit54K577yMQUI9Nu+8jEFDPTTvvIw8YnI+PGltZyB3aWR0aD0xNTYgaGVpZ2h0PTQxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkEvMUMvckJBQ0ZGVV9VcmlBTk82ekFBQURuenV0ekc4MTExLnBuZyIgID7vvIw8YnI+4oi05Zub6L655b2iQUVERn/nmoTlkajplb/mmK88aW1nIHdpZHRoPTE3MiBoZWlnaHQ9MTkgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9GQS8xQy9yQkFDRkZVX1VyaWlNaF9uQUFBRFREMmY1VWc4MDUucG5nIiA+77yMPGJyPuaVhemAiUEu