B1, Cho ΔABC có DE//BC, biết AD = 2cm, BD=1cm và AC=4cm. Tính EC

B2, ΔABC nhọn có AC > AB, AC =45cm. Đường cao AH. Đường trung trực của BC cắt cạnh AC tại N, biết HB = 15cm, HC =27 cm. Tính CN

Tìm x

(1 - x)³ + (x - 2)³ = -3(x - 1)²

B1.Rewrite the sentences as directed in the brackets.

1.Dont let your children to play in the kitchen. (Correct the mistake)

2.Souting began in England in 1907.(Make a questions for the underlined word .

3.Nam said to the taxi driver, "Please turn left at the first traffic light". (report the sentence)

4."Can you tidy the house now, Hoa? "Mrs Lien said.

=>Mrs Lien asked.....

5."Don't make noise in class"The teacher said to the students.

=>The teacher asked the student....

B1.Tim nghiem.

a) (x-1)(x^2+1)

b)x^2+4x

c)x^2-8x

d)x^3-x

1....., I lost my keys on the way home. (fortunate)

2.She was.... enough to believe him. (fool)

3.A fairy....changed Little Pea's rags into beautiful clothes. (magic)

4.Don't leave the light on.It wastes.....(electric)

5.The ....of atom bomb is very terrible. (destroy)

6.Hard work always brings..... (succeed)

1.Sandra needs.....her English writing. (improve)

2.She asked me.... for him. (not wait)

3.He....the rugs last Sunday. (rub)

4.That bag looks heavy. I...you with it. (help)

5.Listen to those people. What language....they.....? (talk)

6.Rice .....in cold climates. (not grow)