《2025年快乐过暑假江苏凤凰科学技术出版社七年级提优版》

4. 已知：如图所示,在△ABC中,点D,E,F分别为BC,AD,CE的中点,且$S_{\triangle ABC}= 4cm^{2}$,则阴影部分的面积为______1$cm^{2}$.

答案： 1

5. 如图,已知△ABC≌△DEB,点E在AB上,AC与BD交于点F,AB= 6,BC= 3,∠C= $55^{\circ}$,∠D= $25^{\circ}$.
(1)求AE的长度；3
(2)求∠AED的度数.80°

答案：
(1)
∵△ABC≌△DEB，
∴BE=BC=3，
∴AE=AB−BE=6−3=3.
(2)
∵△ABC≌△DEB，
∴∠A=∠D=25°，∠DBE=∠C=55°，
∴∠AED=∠DBE+∠D=55°+25°=80°.

1. The woman finally made her son B after she told him some jokes.
A.laughed
B.laugh
C.to laugh
D.laughing

答案： B

2. At these beautiful paper-cuts, we felt excited and D. That is really amazing!
A.colourful
B.hopeful
C.helpful
D.cheerful

答案： D