Hãy biến đổi mẫu thành bình phương của 1 số hoặc 1 biểu thức rồi khai phương mẫu (đưa ra ngoài căn)

$\sqrt{\frac{3}{5}}; \sqrt{\frac{3}{8}}; \sqrt{\frac{5b}{a}} (với a,b>0)$

Tính giá trị biểu thức:

C = $\frac{3}{4}{(x-2)}^3 : -\frac{1}{2}(2-x) tại x=3$

D = ${(x-y+z)}^5 : {(-x+y-z)}^3 tại x=17, y=16 và z=1$

E = $54{(a-b-1)}^2 : -18(1-a+b) tại a=21 và b=-10$

F = ${(2-2m)}^{6 } : {(m-1)}^3 tại m=11$

I. Complete the sentences with the correct form of the verbs in brackets.
1. Would you mind _____________ (watch) my bag for a few minutes?
2. I enjoy _____________ (listen) to music while I’m doing the cooking.
3. He wants _____________ (buy) a new computer game.
4. I’d like _____________ (speak) to Mr Davis, please. Is he there?
5. Please avoid _____________ (make) silly mistakes in this exercise.
6. The children would love _____________ (eat) French fries.
7. She really loves _____________ (work) with children.
8. We tried _____________ (call) you but your mobile was off.
9. They intend _____________ (build) houses on the school playing fields.
10. I can’t stand _____________ (do) the washing up.

1. I ______________ (listen) to music in my free time.
2. It often (rain) ______________ in the summer.
3. Do you think that he ______________ (recognise) me?
4. We ______________ (not want) to see that film because it looks boring.
5. What time __________ the film __________ (begin)?
6. I promise that I ______________ (not be) late for school again.
7. Simon usually ______________ (do) his homework and ______________ (watch) TV at the same time.
8. The students ______________ (plant) some flowers in the schoolyard tomorrow.
9. Nam and Vinh______________ (play) volleyball three times a week.
10. The train ______________ (leave) at 6 o’clock in the morning.

1. She usually goes _____ with her friends in the pool near her school.
2. Sarah likes _____________. She plants lots of flowers and vegetables in her home garden.
3. Every weekend, I go _____________ in my uncle’s boat, or just off the shoreline.
4. In later years, he took up _____________ as a hobby. He drew watercolour landscapes.
5. My hobby is listening to _____________. It can help relax my mind.
6. I have recently started a new hobby – collecting _____________.
7. Most people take _______ and post them on their social networking accounts.
8. Carving _________ is a great hobby that can make you happier

Tìm x, biết:

$\sqrt{4.(x^2+6x+9)}=8$

Chỉ khâu để làm j?

$$\begin{gathered} Tìm x, biết: \\ a) \sqrt{{(x-2)}^2} =3 \\ b) \sqrt{4.(x^{2 }+ 6x+9) } \\ c) \sqrt{3x^2-6x+3}=\sqrt{3} \end{gathered}$$