Put in the correct verb forms 

1. if you_____you glasses, you would see much better (clean)

2. i_____ and see you tomorrow if i have time (come)

3. if she spoke more slowly, perhaps i______ her (understand)

4. if you _____at 12.00, you will arive at 3.20 (leave) 

5. i_____ my car if i needed money (sell)

Put in the correct verb forms 

1. if you_____you glasses, you would see much better (clean)

2. i_____ and see you tomorrow if i have time (come)

3. if she spoke more slowly, perhaps i______ her (understand)

4. if you _____at 12.00, you will arive at 3.20 (leave) 

5. i_____ my car if i needed money (sell)

Bài 1.  Cho hình thang cân ABCD (AB//CD) có D̂ = 60⁰, CD = 49 cm, AB = 15 cm. Qua B vẽ đường thẳng song song với AD cắt CD tại E

a)     Chứng minh rằng BCE là tam giác đều.

b)    Tính EC và chu vi hình thang ABCD.

Bài 6. Chứng minh rằng:

a)    x² + 3x + 7 > 0 , với mọi x

b)   5x - x² - 8 < 0 , với mọi x

Bài 5. Tìm x, biết:

a) x (2x - 7) + 4x -14 = 0

b) x³ - 9x = 0

c)  4x² -1 - 2(2x -1)2  = 0

d) (x³ - x² ) - 4x² + 8x - 4 = 0