54+54
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Chọn các đáp án đúng:
(54 : 9) : 3 = 54 : (9 : 3)
(54 + 9) + 3 = 54 + (9 + 3)
(54 - 9) - 3 = 54 - (9 - 3)
(54 x 9) x 3 = 54 x (9 x 3
ý thứ 2 và ý thứ 4, k nhé , mình nhanh nhất đó
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Chọn các đáp án đúng:
(54 : 9) : 3 = 54 : (9 : 3)
(54 + 9) + 3 = 54 + (9 + 3)
(54 - 9) - 3 = 54 - (9 - 3)
(54 x 9) x 3 = 54 x (9 x 3
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Một căn phòng hình chữ nhật có chiều dài 10 m, chiều rộng bằng 3/5 chiều dài, người ta muốn lát nền căn phòng đó. Biết mỗi viên gạch dạng hình chữ nhật với chiều dài 6dm, chiều rộng 5 dm. Hỏi người đó cần bao nhiêu viên gạch?
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Một căn phòng hình chữ nhật có chiều dài 10 m, chiều rộng bằng 3/5 chiều dài, người ta muốn lát nền căn phòng đó. Biết mỗi viên gạch dạng hình chữ nhật với chiều dài 6dm, chiều rộng 5 dm. Hỏi người đó cần bao nhiêu viên gạch?
Chiều rộng của căn phòng là:
\(10\times\frac{3}{5}=6\left(m\right)\)
Diện tích căn phòng là:
\(10\times6=60\left(m^2\right)\)
Diện tích mỗi viên gạch là:
\(6\times5=30\left(dm^2\right)\)
Đổi: \(30dm^2=0,3m^2\).
Người đó cần số viên gạch là:
\(60\div0,3=200\)(viên)
29 tháng 5 2022 lúc 21:05
tính nhanh :54/1x3x7 + 54/3x7x9 + 54/7x9x13 + 54/9x13x15
= 54/6. [6/1.3.7 +6/3.7.9 +6/7.9.13 + 6/9.13.15]
=54/6 [1/1.3-1/3.7 + 1/3.7 - 1/7.9 + 1/7.9 - 1/9.13 + 1/9.13 -1/13.15]
=54/6[1/3- 1/13.15]
=54/6 .64/195
=192/65
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Phân tích số 54 ra thừa số nguyên tố được:
A. 54 = 2.33 B. 54 = 3.23 C. 54 = 2.32 D. 54 = 3.22
Ta có: \(54=6\cdot9=2\cdot3\cdot3\cdot3=2\cdot3^3\)
Chọn A.
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Tính tích : (- 54 + 1) . (-54 + 2) . (- 54 + 3) . ... . (- 54 + 1000)
tích trên có 1000 số hạng
=-54.(1+2+...+999+1000)
=-54.500500
=-27027000
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=-53 *(-52)*...*0*...*945
=0
k minh nha
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Tìm lỗi sai và sửa:1. This book was writting by Jack London, an American writer2. Two new houses have just been build here.3. The picture was painting by Michael when we came.4. A new shop was opening on Main Street last week.5. A new department store is building in our twon at the moment.6. Will they teach math by Mr Quang next Sunday?7. Nobody were injured in the accident, were they?8. A new hospital has been building in my neighborhood recently.9. Hamlet was wroten by William Shakespeare.10....
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Tìm lỗi sai và sửa:
1. This book was writting by Jack London, an American writer
2. Two new houses have just been build here.
3. The picture was painting by Michael when we came.
4. A new shop was opening on Main Street last week.
5. A new department store is building in our twon at the moment.
6. Will they teach math by Mr Quang next Sunday?
7. Nobody were injured in the accident, were they?
8. A new hospital has been building in my neighborhood recently.
9. Hamlet was wroten by William Shakespeare.
10. I am always made wash my hands before every meal.
1 was writting -> was wrote
2 build->built
3 mik ko bt
4 was opening-> opened
5 mik ko bt
6teach-> be taught
7 were-> was
8 building-> built
9 wroten-> written
10 am -> X
mình nghĩ vậy thôi nếu sai thì sorry nha
Tìm lỗi sai và sửa:
1. This book was writting by Jack London, an American writer
=> the
2. Two new houses have just been build here.
=> built
3. The picture was painting by Michael when we came.
=> painted
4. A new shop was opening on Main Street last week.
=> opened
5. A new department store is building in our twon at the moment.
=> is being built
6. Will they teach math by Mr Quang next Sunday?
=> be taught
7. Nobody were injured in the accident, were they?
=> was / was it
8. A new hospital has been building in my neighborhood recently.
=> built
9. Hamlet was wroten by William Shakespeare.
=> written
10. I am always made wash my hands before every meal.
=> make to wash
Câu 10 là made to wash : bị bắt phải làm gì nhé
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54 nhan 54 nhan 67 cong 54 nhan ba nam tru 54 nhan 3
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It may seem unbelievable, but it is quite possible that the days of secretary are coming to an end. There is (1. evident)…………….to suggest that professional people such as doctors, (2. law)…………….and managers are dealing with (3. correspond)…………….personally rather than having a secretary do it. And the reason is simple: modern technology.Until recently, secretaries were extremely (4. use)…………….for typing letters to (5. custom)…………….and clients, for arranging meetings and dealing with travel (6. ar...
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It may seem unbelievable, but it is quite possible that the days of secretary are coming to an end. There is (1. evident)…………….to suggest that professional people such as doctors, (2. law)…………….and managers are dealing with (3. correspond)…………….personally rather than having a secretary do it. And the reason is simple: modern technology.
Until recently, secretaries were extremely (4. use)…………….for typing letters to (5. custom)…………….and clients, for arranging meetings and dealing with travel (6. arrange)……… Answering the telephone was also another of their major (7. responsible)……………. However, with the introduction of email and mobile phones, managers are able to do more and more of these (8. active)……………. themselves. Many companies (9. current)……………have fewer secretaries than they did five years ago. However, (10. employ)…………….does not seem to have increased as a result. Rather, secretaries are finding new positions as personal assistants and even managers themselves.
It may seem unbelievable, but it is quite possible that the days of secretary are coming to an end. There is evidence to suggest that professional people such as doctors, lawyer and managers are dealing with correspondence perrsonally rather than having a secretary do it. And the reason is simple: modern technology.
Until recently, secretaries were extremely useful for typing letters to customers and clients, for arranging meetings and dealing with travel arrangements. Answering the telephone was also another of their major responsiblities.. However, with the introduction of email and mobile phones, managers are able to do more and more of these activites themselves. Many companies currently have fewer secretaries than they did five years ago. However, employees does not seem to have increased as a result. Rather, secretaries are finding new positions as personal assistants and even managers themselves.
I.Rút gọn các biểu thức sau:a) A(a+b)^3+(a-b)^3b) B(x-y)^3-3(y-x)^2.z+3(x-y)z^2-z^3c) C(k-4)(k^2+4k16)-(128-k^3)d) D(a+b+c)^3+(a-b-c)^3II.Tìm xa) (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^215b) x(x-5)(x+5)-(x+2)(x^2-2x+4)3c) 8x^3-12x^2+6x1III.Cho x+y1.Tính giá trị các biểu thức saua)A2(x^3+y^3)-3(x^2-y^2)b)Bx^3+y^3+3xyIV.Chứng minh rằng(a+b+c)^3a^3+b^3+c^3+3(a+b)(b+c)(c+a) với mọi a, b, cV.(*)a)Cho a+b+c0.Chứng minh rằng a^3+b^3+c^33abcb) Cho a^3+b^3+c^33abc.Chứng minh rằng a+b+c0 hoặc abc0Làm được câu nào...
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I.Rút gọn các biểu thức sau:
a) A=(a+b)^3+(a-b)^3
b) B=(x-y)^3-3(y-x)^2.z+3(x-y)z^2-z^3
c) C=(k-4)(k^2+4k16)-(128-k^3)
d) D=(a+b+c)^3+(a-b-c)^3
II.Tìm x
a) (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2=15
b) x(x-5)(x+5)-(x+2)(x^2-2x+4)=3
c) 8x^3-12x^2+6x=1
III.Cho x+y=1.Tính giá trị các biểu thức sau
a)A=2(x^3+y^3)-3(x^2-y^2)
b)B=x^3+y^3+3xy
IV.Chứng minh rằng(a+b+c)^3=a^3+b^3+c^3+3(a+b)(b+c)(c+a) với mọi a, b, c
V.(*)
a)Cho a+b+c=0.Chứng minh rằng a^3+b^3+c^3=3abc
b) Cho a^3+b^3+c^3=3abc.Chứng minh rằng a+b+c=0 hoặc a=b=c=0
Làm được câu nào thì làm hộ mình với [T.T]...
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.Question 1. _____________his aunt really likes the apartment, she cant afford to buy it.A. Although B. Because C. If D. SoQuestion 2. The doctor advised my uncle to stop ____________because its quite harmful to his health.A. to smoking B. smoking C. to smoke D. smokeQuestion 3. More and more young people are moving to the city...
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Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 1. _____________his aunt really likes the apartment, she can't afford to buy it.
A. Although B. Because C. If D. So
Question 2. The doctor advised my uncle to stop ____________because it's quite harmful to his health.
A. to smoking B. smoking C. to smoke D. smoke
Question 3. More and more young people are moving to the city as there are ________ of job opportunities here.
A. much B. a lot C. a little D. many
Question 4. The artwork was _______done by the artisan.
A. careless B. careful C. carefully D. care
Question 5. The light went out while he ____________dinner with his family.
A. is having B. have had C. had D. was having
Question 6. Last Sunday we arrived at the waterfall nearby _________7.00 a.m.
A. of B. at C. in D. on
Question 7. The students enjoy ___________badminton every morning.
A. played B. playing C. plays D. to play
Question 8. They decided to learn French ________study in Paris.
A. so that B. so as to C. in order that D. in order
Question 9. Your brother passed the final exam, _________?
A. did he B. doesn't he C. does he D. didn't he
Question 10. I got some____________ advice on how to make a presentation from my English teacher, so I passed my oral test.
A. useless B. uselessness C. useful D. usefulness
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 1. _____________his aunt really s the apartment, she can't afford to buy it.
A. Although B. Because C. If D. So
Question 2. The doctor advised my uncle to stop ____________because it's quite harmful to his health.
A. to smoking B. smoking C. to smoke D. smoke
Question 3. More and more young people are moving to the city as there are ________ of job opportunities here.
A. much B. a lot C. a little D. many
Question 4. The artwork was _______done by the artisan.
A. careless B. careful C. carefully D. care
Question 5. The light went out while he ____________dinner with his family.
A. is having B. have had C. had D. was having
Question 6. Last Sunday we arrived at the waterfall nearby _________7.00 a.m.
A. of B. at C. in D. on
Question 7. The students enjoy ___________badminton every morning.
A. played B. playing C. plays D. to play
Question 8. They decided to learn French ________study in Paris.
A. so that B. so as to C. in order that D. in order
Question 9. Your brother passed the final exam, _________?
A. did he B. doesn't he C. does he D. didn't he
Question 10. I got some____________ advice on how to make a presentation from my English teacher, so I passed my oral test.
A. useless B. uselessness C. useful D. usefulness
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 1. _____________his aunt really s the apartment, she can't afford to buy it.
A. Although B. Because C. If D. So
Question 2. The doctor advised my uncle to stop ____________because it's quite harmful to his health.
A. to smoking B. smoking C. to smoke D. smoke
Question 3. More and more young people are moving to the city as there are ________ of job opportunities here.
A. much B. a lot C. a little D. many
Question 4. The artwork was _______done by the artisan.
A. careless B. careful C. carefully D. care
Question 5. The light went out while he ____________dinner with his family.
A. is having B. have had C. had D. was having
Question 6. Last Sunday we arrived at the waterfall nearby _________7.00 a.m.
A. of B. at C. in D. on
Question 7. The students enjoy ___________badminton every morning.
A. played B. playing C. plays D. to play
Question 8. They decided to learn French ________study in Paris.
A. so that B. so as to C. in order that D. in order
Question 9. Your brother passed the final exam, _________?
A. did he B. doesn't he C. does he D. didn't he
Question 10. I got some____________ advice on how to make a presentation from my English teacher, so I passed my oral test.
A. useless B. uselessness C. useful D. usefulness
#H_ọ_c_t_ố_t
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 1. _____________his aunt really s the apartment, she can't afford to buy it.
A. Although B. Because C. If D. So
Question 2. The doctor advised my uncle to stop ____________because it's quite harmful to his health.
A. to smoking B. smoking C. to smoke D. smoke
Question 3. More and more young people are moving to the city as there are ________ of job opportunities here.
A. much B. a lot C. a little D. many
Question 4. The artwork was _______done by the artisan.
A. careless B. careful C. carefully D. care
Question 5. The light went out while he ____________dinner with his family.
A. is having B. have had C. had D. was having
Question 6. Last Sunday we arrived at the waterfall nearby _________7.00 a.m.
A. of B. at C. in D. on
Question 7. The students enjoy ___________badminton every morning.
A. played B. playing C. plays D. to play
Question 8. They decided to learn French ________study in Paris.
A. so that B. so as to C. in order that D. in order
Question 9. Your brother passed the final exam, _________?
A. did he B. doesn't he C. does he D. didn't he
Question 10. I got some____________ advice on how to make a presentation from my English teacher, so I passed my oral test.
A. useless B. uselessness C. useful D. usefulness