256+257
K
Khách
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Những câu hỏi liên quan
A
1
5 tháng 5 2016
Hai tích bằng nhau vì tổng các số hạng hàng đơn vị bằng nhau ,còn lại giống nhau
Chúc bạn thi cuối kì thật tốt !
NN
Nguyễn Ngọc Anh Minh
CTVHS
13 tháng 10 2023
\(A=1+\dfrac{1}{2}+1+\dfrac{1}{4}+1+\dfrac{1}{8}+...+1+\dfrac{1}{256}+1+\dfrac{1}{512}=\)
\(=1x\left(\dfrac{512-2}{2}+1\right)+\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{...1}{256}+\dfrac{1}{512}\right)=\)
\(256+B\)
\(2B=1+\dfrac{1}{2}+\dfrac{1}{4}+...+\dfrac{1}{512}+\dfrac{1}{1024}\)
\(B=2B-B=1+\dfrac{1}{1024}\)
\(\Rightarrow A=265+1+\dfrac{1}{1024}\)
24 tháng 1 2022
TL:
1) A < B
( GT: Vì B phải quy đồng )
2) \(x=1\)
\(x=1\)
( GT: Vì 7 = 7 x 1 = 7 )
15 tháng 8 2015
Ta coi số hạng đó là x:
Ta có:
(x - 1 ) : 1 + 1 = 257
(x - 1 ) : 1 =257 - 1
(x - 1 ) : 1 =256
x - 1 =256
x = 256 + 1
x = 257
25 tháng 11 2021
Mình không biết. Chỉ biết nó không phải của lớp 3 thôi.
DT
Đỗ Thanh Hải
CTVVIP
18 tháng 7 2021
256/ Hundreds / journalists / be / uniform.
a Hundreds of the journalists is uniform.
b Hundreds of the journalists are in uniform.
c Hundreds of the journalists is in uniform.
d Hundreds the journalists are uniform.
257/ Children / like / summer / which / season / holiday.
a Children like summer which are the season to holiday.
b Children like summer which is the season of holiday.
c Children like summer which is the season to holiday.
d Children like summer which are the season of holiday.
258/ I/ feel doubtful/ his ability/ write/ new satellite.
a I feel doubtful on his ability to write about the new sattelite.
b I feel doubtful about his ability to write about the new sattelite.
c I feel doubtful at his ability to write about the new sattelite.
d I feel doubtful with his ability to write about the new sattelite.
259/ He / ride / bicycle / around / town / twice / month.
a He rides a bicycle around the town twice a month.
b He ride a bicycle around the town twice a month.
c He rides an bicycle around the town twice per month.
d He ride an bicycle around the town twice a month.
260/ How long / it / take / you / go / school?
a How long does it take you to go to school?
b How long does it take you to go to the school?
c How long does it take you go to the school?
d How long does it take you go school?
261/ They / practice / Saint Paul hospital / this time.
a They are practise at Saint Paul hospital this time.
b They is practising at Saint Paul hospital this time.
c They are practising at Saint Paul hospital this time.
d They is practise at Saint Paul hospital this time.
262/ They / take / patient / hospital / ambulance / yesterday.
a They took the patient to hospital by ambulance yesterday.
b They took the patient to the hospital with ambulance yesterday.
c They take the patient to hospital with ambulance yesterday.
d They take the patient to the hospital by ambulance yesterday.
263/ What / be / matter / you / last Saturday?
a What is the matter with you last Sunday?
b What was the matter with you last Sunday?
c What was matter to you last Sunday?
d What is the matter to you last Sunday?
264/ The nurse / give / Mr. John / injection / 20 minutes ago.
a The nurse gives Mr. John a injection 20 minutes ago.
b The nurse gave Mr. John a injection 20 minutes ago.
c The nurse gives Mr. John an injection 20 minutes ago.
d The nurse gave Mr. John an injection 20 minutes ago.
265/ She / stay / home / look after / sick daughter / last summer.
a She stayed at home look after her sick daughter last summer.
b She stayed at home to look after her sick daughter last summer.
c She stayed home look after her sick daughter last summer.
d She stayed home to look after her sick daughter last summer.
266/ Yesterday there / be / accident. You / see / it ? a Yesterday there were an accident. Did you see it? b Yesterday there were a accident. Did you see it? c Yesterday there was an accident. Did you see it? d Yesterday there was a accident. Did you see it? 267/ She / be / one of / most famous people / world. a She is one of most famous people in the world. b She is the most famous people in the world. c She is one the most famous people in the world. d She is one of the most famous people in the world. 268/ What time / you get up/ yesterday morning? a What time do you get up yesterday morning? b What time you get up yesterday morning? c What time did you get up yesterday morning? d What time will you get up yesterday morning? 269/ I / wake / up early / got up / 6 o’clock yesterday. a I wake up early and got up in 6 o’clock yesterday. b I woke up early and got up at 6 o’clock yesterday. c I woke up early and got up in 6 o’clock yesterday. d I wake up early and got up at 6 o’clock yesterday. 270/ Nurse / give / baby / injection / this morning. a A nurse give the baby any injection this morning. b A nurse gave the baby an injection this morning. c A nurse gave the baby injection this morning. d A nurse give the baby a injection this morning. 271/ Pulse rate / be / not / normally / slower / 50 per minute. a Pulse rate isn’t normally slower to 50 per minute. b Pulse rate isn’t normally more slower to 50 per minute. c Pulse rate isn’t normally slower than 50 per minute. d Pulse rate isn’t normally more slower than 50 per minute. 272/ Patient / feel / better/ she / be/ yesterday. a The patient feel more better than she was yesterday. b The patient feels the better than she was yesterday. c The patient feel better than she was yesterday. d The patient feels better than she was yesterday. 273/ He / always / walk / school / some / of / friends/ but / this week/ get/ bus a He always walks to school with some of his friends, but this week he is getting to school by bus. b He always walk to school with some of his friends, but this week he is geting to school with bus. c He always walks to school with some of his friends, but this week he is geting school with bus. d He always walk to school with some of his friends, but this week he is getting school by bus. 274/ Nurse/ take/ his pulse/ blood pressure/ half - hourly/ yesterday. a The nurse takes his pulse and blood pressure half-hourly yesterday. b The nurse take his pulse and blood pressure half-hourly yesterday. c The nurse took his pulse and blood pressure half-hourly yesterday. d The nurse taked his pulse and blood pressure half-hourly yesterday. 275/ Nurse/ be/ take/ new patient/ to/ X - ray department/ now. a The nurse taking the new patient to the X-ray department now. b The nurse is take the new patient to the X-ray department now. c The nurse take the new patient to the X-ray department now. d The nurse is taking the new patient to the X-ray department now. 276/ Three months ago/ price/ bar/ chocolate / be/ twenty pence. a Three months ago the price of a bar of chocolate were twenty pence. b Three months ago the price of an bar of chocolate was twenty pence. c Three months ago the price of a bar of chocolate was twenty pence. d Three months ago the price of an bar of chocolate were twenty pence. 277/ I/ could not/ go out/ because/ it/ be/ too late. a I couldn’t go out because it was too late. b I couldn’t go out because it were too late. c I couldn’t go out because of it was too late. d I couldn’t go out because of it were too late. 278/ It/ not/ difficult/ me/ make dressing and remove stitches. a It isn’t difficult to me make dressing and remove stitches. b It isn’t difficult for me to make dressing and remove stitches. c It isn’t difficult with me make dressing and remove stitches. d It isn’t difficult for me make dressing and remove stitches. 279/ What / happen/ you/ last Sunday? a What did happened to you last Sunday? b What happened to you last Sunday? c What did happen to you last Sunday? d What happen to you last Sunday? 280/ What/ the most important thing/ your life? a What are the most important thing for your life? b What is the most important thing for your life? c What is the most important thing in your life? d What are the most important thing in your life? 281/ Why/ do not/ you/ come back/ home/ on/ time last night? a Why didn’t you come back home on time last night? b Why don't you came back home on time last night? c Why didn’t you came back home on time last night? d Why don’t you come back home on time last night? 282/ She/ remove stitches/ room 3/ at this moment. a She remove stitches in room 3 at this moment. b She will removing stitches in room 3 at this moment. c She removes stitches in room 3 at this moment. d She is removing stitches in room 3 at this moment. 283/ She/ left/ me/ without/ say/ anything. a He left me without saying anything. b He left me without say anything. c He left me without to say anything. d He left me without to saying anything 284/ Woman / daughter / we meet / yesterday / nurse. a The woman that daughter we met yesterday is a nurse. b The woman whom daughter we met yesterday is a nurse. c The woman who daughter we met yesterday is a nurse. d The woman whose daughter we met yesterday is a nurse. 285/ make/ law/ effective/ only/ this way. a We can make this law effective only on this way. b We can make this law effective only in this way. c We can to make this law effective only in this way. d We can to make this law effective only on this way.
DT
Đỗ Thanh Hải
CTVVIP
18 tháng 7 2021
:))
256/ Hundreds / journalists / be / uniform.
a Hundreds of the journalists is uniform.
b Hundreds of the journalists are in uniform.
c Hundreds of the journalists is in uniform.
d Hundreds the journalists are uniform.
257/ Children / like / summer / which / season / holiday.
a Children like summer which are the season to holiday.
b Children like summer which is the season of holiday.
c Children like summer which is the season to holiday.
d Children like summer which are the season of holiday.
258/ I/ feel doubtful/ his ability/ write/ new satellite.
a I feel doubtful on his ability to write about the new sattelite.
b I feel doubtful about his ability to write about the new sattelite.
c I feel doubtful at his ability to write about the new sattelite.
d I feel doubtful with his ability to write about the new sattelite.
259/ He / ride / bicycle / around / town / twice / month.
a He rides a bicycle around the town twice a month.
b He ride a bicycle around the town twice a month.
c He rides an bicycle around the town twice per month.
d He ride an bicycle around the town twice a month.
260/ How long / it / take / you / go / school?
a How long does it take you to go to school?
b How long does it take you to go to the school?
c How long does it take you go to the school?
d How long does it take you go school?
261/ They / practice / Saint Paul hospital / this time.
a They are practise at Saint Paul hospital this time.
b They is practising at Saint Paul hospital this time.
c They are practising at Saint Paul hospital this time.
d They is practise at Saint Paul hospital this time.
262/ They / take / patient / hospital / ambulance / yesterday.
a They took the patient to hospital by ambulance yesterday.
b They took the patient to the hospital with ambulance yesterday.
c They take the patient to hospital with ambulance yesterday.
d They take the patient to the hospital by ambulance yesterday.
263/ What / be / matter / you / last Saturday?
a What is the matter with you last Sunday?
b What was the matter with you last Sunday?
c What was matter to you last Sunday?
d What is the matter to you last Sunday?
264/ The nurse / give / Mr. John / injection / 20 minutes ago.
a The nurse gives Mr. John a injection 20 minutes ago.
b The nurse gave Mr. John a injection 20 minutes ago.
c The nurse gives Mr. John an injection 20 minutes ago.
d The nurse gave Mr. John an injection 20 minutes ago.
265/ She / stay / home / look after / sick daughter / last summer.
a She stayed at home look after her sick daughter last summer.
b She stayed at home to look after her sick daughter last summer.
c She stayed home look after her sick daughter last summer.
d She stayed home to look after her sick daughter last summer.
266/ Yesterday there / be / accident. You / see / it ? a Yesterday there were an accident. Did you see it? b Yesterday there were a accident. Did you see it? c Yesterday there was an accident. Did you see it? d Yesterday there was a accident. Did you see it? 267/ She / be / one of / most famous people / world. a She is one of most famous people in the world. b She is the most famous people in the world. c She is one the most famous people in the world. d She is one of the most famous people in the world. 268/ What time / you get up/ yesterday morning? a What time do you get up yesterday morning? b What time you get up yesterday morning? c What time did you get up yesterday morning? d What time will you get up yesterday morning? 269/ I / wake / up early / got up / 6 o’clock yesterday. a I wake up early and got up in 6 o’clock yesterday. b I woke up early and got up at 6 o’clock yesterday. c I woke up early and got up in 6 o’clock yesterday. d I wake up early and got up at 6 o’clock yesterday. 270/ Nurse / give / baby / injection / this morning. a A nurse give the baby any injection this morning. b A nurse gave the baby an injection this morning. c A nurse gave the baby injection this morning. d A nurse give the baby a injection this morning.
DT
Đỗ Thanh Hải
CTVVIP
22 tháng 8 2021
256. "Be patient," she said to him
.→ She told him ……to be patient…………………………………
257. "Go to your room," her father said to her
.→ Her father told her ……to go to her room…………………………………
258. "Hurry up," she said to us.
→ She told us ……to hurry up…………………………………
259. "Give me the key," he told her
.→ He asked her ……to give him the key…………………………………
260. "Play it again, Sam," she said.
→ She asked Sam …to play it again……………………………………
261. "Sit down, Caron" he said
→ He asked Caron …to sit down……………………………………
L
8 tháng 7 2017
a) 4/15 và 7/18
Quy đồng mẫu số giống nhau (4/15)×6, (7/18)×5
Ta đc
24/90 < 35/90
NK
8 tháng 7 2017
4/15 < 7/18 (Tu quy dong roi tinh)
115/116 < 575/574 (Vi 575/574>1 con 115/116<1)
178/179 < 256/257 (Tu quy dong roi tinh )
513