Biểu thức li độ của vật dao động điều hòa có dạng x = Acos(2ωt + φ), gia tốc của vật có giá trị cực đại là: A. vmax = ωA B. vmax = ω2A C. vmax = - ωA D. vmax = - ω2A

2. Read the passage and use the words from the box to fill the gaps. There are TWO words you will NOT need.
rooms                         desk                    pictures between                      posters                piano bedrooms

Our family lives in a big apartment in the city centre. There are four (1) ___rooms_______, a living room, a kitchen and two bathrooms. The living room is next
to the kitchen. There is a bookshelf (2) __between________ them. In the living room, we hang many (3) _____picture_____ on the wall. There is also a sofa and a coffee
table.
The most favourite place is my bedroom. I have many (4) _posters_________ on the wall about my favourite music bands. There is also a (5) _____piano_____. I
can play my favourite songs when I am stressed

2. Choose the best option to complete each sentence. Circle A, B or C.
1. How many rooms are there ___________ your new house?
A. in                     B. on                                   C. of
2. There ___________ a watch and two pictures on the wall.
A. is                          B. are                                 C. be
3. Let’s ___________ a shopping list for your birthday.
A. make                    B. to make                      C. making
4. Where do you want to put the sofa? – ___________ the window.
A. Between               B. Behind                       C. Next to
5. In Mi's house the tea table is in the middle of the living room. In my house, it is ___________ the sofa and the armchair.
A. between                B. in                           C. next to

6.What is your favourite __________?
A. history              B. vocabulary             C. subject
7. The first __________ we have on Monday is music.
A. lesson                B. homework             C. study
8. During __________ we often play many games in the playground.
A. break time           B. gym time             C. class time
9. John goes to a/an __________ school. His classmates are from many countries.
A. boarding              B. overseas             C. international
10. __________ is my favourite subject. I like learning about how light and sound work among many other things.
A. Maths               B. Physics        C.Computer science

giải phương trình  (0,25)^{x-1}  căn bậc hai của 2 =0,125.16^{2-3x}

xin lỗi trên máy tính ko có dấu căn bậc hai ạ

Cho x, y là hai số dương thỏa mãn x^4 + x^2 + x = y^4 + y^2 + y. Tính giá trị

của biểu thức K = x^2021 + 2021 . y^2021 / x^2021

2x^2 + 7x + 3 = 0

tìm điểm cực trị của hàm số

$y=x^4-8x^2-1$

tìm điểm cực trị của hàm số
$y=2x^3+3x^2-36x+1$

Bài 1: Fe có 26p,30n,26e
a) tính khối lượng 1 nguyên tử fe theo đơn vị kg sau đó đổi sang đơn  vị u
b) tính khối lượng 1 nguyên tử fe theo đơn vị u sau đó đổi sang đơn vị kg