Bạn hỏi - Chuyên gia trả lời
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Khi đu quay hoạt động, vận tốc theo phương ngang của một cabin M phụ thuộc vào góc lượng giác α = (Ox, OM) theo hàm số vx = 0,3sin α (m/s) (Hình 11).
a) Tìm giá trị lớn nhất và giá trị nhỏ nhất của vx.
Dựa vào đồ thị hàm số y = sinx, xác định các giá trị x ∈ [– π; π] thỏa mãn sinx = 12.
Tìm tập giá trị của hàm số y = 2cosx + 1.
Tìm tập xác định của các hàm số sau:
c) y=12−sin2x.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 40.
A. Therefore
B. Due to
C. However
D. Because
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 39.
A. so that
B. in order to
C. so as
D. such as
b) tanx+π4;
a) y=1cosx;
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 38.
A. choose
B. choosing
C. chosen
D. choices
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 37.
A. who
B. whom
C. whose
D. which
Các hàm số dưới đây có là hàm số chẵn hay hàm số lẻ không?
c) y = tan2x.
b) y = cosx + sinx;
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blank 36.
A. like
B. than
C. as
D. that
a) y = 5sin2x + 1;
Có bao nhiêu giá trị x trên đoạn [–2π; 2π] thỏa mãn điều kiện tanx = 2?
Li độ s(cm) của một con lắc đồng hồ theo thời gian t (giây) được cho bởi hàm số s = 2cosπt. Dựa vào đồ thị của hàm số côsin, hãy xác định ở các thời điểm t nào trong 1 giây đầu thì li độ s nằm trong đoạn [– 1; 1] (cm).
You have spent too many time on that homework.
A. spent
B. too
C. many
D. on
“Please turn up the radio, I can’t concentrate on my work”
A. turn up
B. the
C. can't
Hoàn thành bảng giá trị sau đây và xác định các điểm tương ứng trên mặt phẳng tọa độ.
The men are able work better than they did last year.
A. The men
B. able work
C. better
D. did
Ann and Susan have known each other during they were at school.
A. and
B. each other
C. during
D. were
My best friend, that we see every day, always has something new to tell me.
A. best friend
C. has
D. something new
According to the text, women in the 21st century ________.
A. do not have to do housework any more
B. are still the victims of family violence in some rural areas
C. get help from their husbands with all housework
D. spend less than 12 hours working outside the home and doing housework
A. have been eradicated completely
B. disappeared soon after the women's liberation movement
C. still exist at present
D. was forced to change after the women's liberation movement
What did women have to suffer?
A. Good schooling
B. Choosing a husband themselves
C. Enjoy their housework
D. Illiteracy
Years ago, women are not allowed ________.
A. to work in the kitchen
B. to go to school
C. to do housework
D. to stay at home with their parents
Which is not women's role in the former days?
A. Working in authority
B. Doing housework
C. Doing cooking
D. Bearing and rearing children
English has become the main language of.........................
A. communication
B. communicating
C. communicator
D. communicative
She is not really friendly. She does not get on well ..................... her classmates.
A. on
B. from
C. for
D. with
They were late for work because their car ....................... down.
A. broke
B. wnet
C. got
D. took
I have nearly finished reading the book. There are only a few ................. left.
A. pages
B. slices
C. sheets
D. pieces
Xét tính tuần hoàn của hàm số y = cosx và hàm số y = cotx.
We were really....................with the weather.
A. disappointed
B. disappoint
C. disappointment
D. disappointing
Hãy chỉ ra một số thực T sao cho sin(x + T) = sinx với mọi x ∈ℝ.
The river ........................we get our water- supply is nearly empty.
A. from which
B. where
C. which
Anne: “Thanks for the nice gift!” - John: “..........................”
A. I’m glad you like it
B. But do you know how much it costs
C. In fact, I myself don’t like it
D. You’re welcome
Chứng minh rằng hàm số y = sinx và hàm số y = cotx là các hàm số lẻ.
“It was very cold yesterday. The winter is just around the corner. “I think today will be …………… yesterday.”
A. so cold as
B. as cold as
C. cold as
D. so as cold
A: "Would you like me to get it for you?" B: " ......................."
A. I’m glad to
B. Me, too
C. No problem
D. Don’t bother