41 environmental

42 to cancel

43 goes

44 are going to have

45 will volunteer

46 Renewable energy sources will be promoted by the government to reduce greenhouse gas emissions

47 New technologies are going to be developed by scientists to combat climate change

48 The band members worked hard, so they successfully recorded their first album

49 His parents will let him play music in his free time

50 What are you going to do on Sunday morning?

Sửa đề: Với a<=m<b thì tập hợp A giao F khác tập rỗng

Để A\(\cap\)F=∅ thì \(\left[\begin{array}{l}2m+9<0\\ 2m-1\ge5\end{array}\right.\Rightarrow\left[\begin{array}{l}2m<-9\\ 2m\ge6\end{array}\right.\Rightarrow\left[\begin{array}{l}m<-\frac92\\ m\ge3\end{array}\right.\)

=>Để A giao F khác rỗng thì \(-\frac92\le m<3\)

=>a=-9/2; b=3

\(P=2a+5b=2\cdot\frac{-9}{2}+5\cdot3=-9+15=6\)

I. Exercise1: Hãy chọn phương án thích hợp để điền vào chỗ trống.

1. This is…………..…my…... (my/I) book and that is………your... (your/ you) book.

2. Music is…………my….……..(I/ my) favorite subject.

3……I…(I/ My) want to be a teacher and…my.. (my/ me) sister wants to be a doctor.

4. Mai likes English but……………her……….. (her/ she) brother doesn’t.

5. They ………are………(is / are) very nice and friendly.

б. Hoa’s pencil case …is….(is/ are) blue.  (Her/ She) …her…friends’ pencil cases are violet.

7.Those students……are…….( are / is) very heavy.

8. What is………your…. (your/ you) father’s job?...........he.......(He/ His) is an engineer.

9. How old……is…. (are/ is)…your… (your/ you) sister…she…(She/ Her) is ten years old

10. These are my sister room. (They/it) They are very nice

1. getting
2. cooks
3. is playing
4. will come
5. is going to rain
6. to look
7. to pay
8. watch

\(sin^2x+cos^2x=1\)

=>\(cos^2x=1-\left(\dfrac{2}{3}\right)^2=1-\dfrac{4}{9}=\dfrac{5}{9}\)

mà \(cosx>0\)(Vì \(x\in\left(0;\dfrac{\Omega}{2}\right)\))

nên \(cosx=\sqrt{\dfrac{5}{9}}=\dfrac{\sqrt{5}}{3}\)

đề bài đâu hả bạn ?

I went to+place

a. is opened

b. was being pulled down

c. had been cleaned

d. Has the rubbish been collected