SSH của B : ( 3997 - 1 ) : 2 +1 = 1999

=> B = ( 3997 + 1 ) .1999 : 2 = 3996001

Vậy B = 3996001

Lấy số cuối trừ số đầu chia khoảng cách cộng 1 . áp dụng công thức ấy mà tick . Tick mình nha !

SSH:(3997-1):2+1=1999

Tổng:(3997+1)*1999:2=3996001

Ta có:

\(A=\frac{-2012}{4025}=\frac{-2012}{4025}.2=\frac{-4024}{4025}\)

\(B=\frac{-1999}{3997}=\frac{-1999}{3997}.2=\frac{-3998}{3997}\)

\(\frac{4024}{4025}< 1< \frac{3998}{3997}\Rightarrow\frac{4024}{4025}< \frac{3998}{3887}\Rightarrow\frac{-4024}{4025}>\frac{-3998}{3997}\)hay \(\frac{-2012}{4025}>\frac{-1999}{3997}\)

\(\Rightarrow A>B\)

Lấy \(\frac{-1}{2}\) làm phân số trung gian

Ta có: \(\frac{-2013}{4027}>\frac{-2013}{4026}\) và \(\frac{-1999}{3997}< \frac{-1999}{3998}\)

\(\Rightarrow\) \(\frac{-2013}{4027}>\frac{-1}{2}>\frac{-1999}{3997}\)

hay \(\frac{-2013}{4027}>\frac{-1999}{3997}\)

Vậy A > B

Chúc bạn học tốt!

Ta có:

\(\frac{-2013}{4027}< \frac{-2013}{4026}=\frac{-1}{2}\) (1)

\(\frac{-1999}{3997}>\frac{-1999}{3998}=\frac{-1}{2}\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\frac{-2013}{4027}< \frac{-1}{2}< \frac{-1999}{3997}\Rightarrow\frac{-2013}{4027}< \frac{-1999}{3997}\)

Vậy ....

Bn Ngô Tuấn Anh là người ra câu hỏi rồi bạn trả lời luôn

A lon hon

\(A=\dfrac{-2012}{4025}< 0\)

\(B=\dfrac{1999}{3997}>0\)

\(\Rightarrow A< B\)

100  x ab + 45 =3997 - ab x 4

100 x ab + 4 x ab = 3997 - 45

104 x ab = 3952

ab = 3952 : 104 = 38

III. Give the correct form of verbs in brackets.
1. Mr. John is the teacher now. He (teach) .......has taught................... English since he came here in 1999.
2. If everyone (come) ............comes............ here, wake me up immediately.
3. Please come on time. I hate (be) ...being............... kept (wait) ........waiting....................
4. Water (boil)...........Does-boil......... at 1000C?
5. Maya, an ethnic girl, always wants to (become) ....become.................. an English teacher in the near future.
IV. Choose the best word to complete the passage below.
In the United States of America, the national language is (1)............ English. Four hundred years ago, some
English people came to North America to live and they brought (2).......... language to this country.
Now in the USA, people speak (3)...........English . Most of the words are the (4)............ in American and
British English, but the Americans say some English words not as people (5)........... in England. Canada is
(6).......... to the North of the United States of America. It is larger (7)......... the United States. In Canada,
many people (8)............ English because they also came from England many years (9)......... But in some parts
of Canada, people speak (10)............ because they came from France.
1. A. also. B. like. C. as. D. not.
2. A. French. B. English. C. Chinese. D. Canadian.
3. A. British. B. American. C. Russian. D. Chinese.
4. A. various. B. similar. C. same. D. like. 
5. A. do. B. tell. C. talk. D. speak.
6. A. lies. B. situated. C. at. D. in.
7. A. than. B. as. C. more. D. less.
8. A. say. B. tell. C. talk. D. speak.
9. A. ago. B. later. C. there. D. here.
10. A. France. B. French. C. Russian. D. Italian