Với giá trị của x có nghĩa sau

a) √(2x-3)(3x-2)

B) 1/√x²-8x+15

I.Give the correct form of the verbs in the blankets:

1.Let night I......... read in bed when studdenly I heard a scream.

II.Give the correct form of the verbs in the blankets:

1.My brother (join).......thể army when he(be)......young.

2.Miss Lee often (write)......when she was ơn holiday.

3.He (leave)...........home two weeks ago.

4. When the teacher came in,the pupils(play)........games 5.Columbus (discover).......America more then 400 years ago.

6. I last(see) ......him since last Sunday.

7. She playing the piano when our guest (arrive)....last night.

8. The light went out when we (have)......dinner.

√5x³. √125x (x>0)

√2x/27. √3/8x(x>0)

1/x+5√36(x+5)² với x≥-5

(2_ a+3√a |√a+3)(2- 6√a-√ab | √b-5)