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30 tháng 8 2019

https://dethi.violet.vn/present/15-de-thi-hsg-ngu-van-6-co-dap-an-rat-hay-11067902.html    

https://sinhvienshare.com/tag/de-thi-hoc-sinh-gioi-ngu-van-lop-6-co-dap-an/

https://dehocsinhgioi.com/tag/de-thi-hoc-sinh-gioi-mon-ngu-van-lop-6-co-dap-an/

link tham khảo nek 

@Châu;s ngốc

30 tháng 8 2019

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

29 tháng 4 2018

vết nhầm

29 tháng 4 2018

:v tự viết tự trả lời lun kìa haha !#Huy$%^&*(Ơ}

24 tháng 11 2016

Gọi d là ƯCLN(2n+5,n+3)(d\(\in\)N*)

Ta có:\(2n+5⋮d,n+3⋮d\)

\(\Rightarrow2n+5⋮d,2\cdot\left(n+3\right)⋮d\)

\(\Rightarrow2n+5⋮d,2n+6⋮d\)

\(\Rightarrow\left(2n+6\right)-\left(2n+5\right)⋮d\)

\(\Rightarrow1⋮d\Rightarrow d=1\)

Vì ƯCLN(2n+5,n+3)=1

\(\Rightarrow\frac{2n+5}{n+3}\) là phân số tối giản

 

Gọi d là ƯCLN(2n+5,n+3)(d

N*)

Ta có:2n+5⋮d,n+3⋮d

 

⇒2n+5⋮d,2⋅(n+3)⋮d

 

⇒2n+5⋮d,2n+6⋮d

 

⇒(2n+6)−(2n+5)⋮d

 

⇒1⋮d⇒d=1

 

Vì ƯCLN(2n+5,n+3)=1

KỲ THI CHỌN HỌC SINH NĂNG KHIẾU LỚP 7 CẤP HUYỆN ĐỀ CHÍNH THỨC  NĂM HỌC : 2011 - 2012                                                                  ĐỀ THI MÔN: TIẾNG ANH Thời gian làm bài: 90 phút ( Không kể thời gian giao đề ). I.Choose the word whose underlined is pronounced differently from that of the rest.1.    A. chore                              B. match                             C. chemical                         D. armchair2.    A. mend...
Đọc tiếp

KỲ THI CHỌN HỌC SINH NĂNG KHIẾU LỚP 7 CẤP HUYỆN

ĐỀ CHÍNH THỨC

 

 

NĂM HỌC : 2011 - 2012

 

                                                                 ĐỀ THI MÔN: TIẾNG ANH

Thời gian làm bài: 90 phút ( Không kể thời gian giao đề ).

 

I.Choose the word whose underlined is pronounced differently from that of the rest.

1.    A. chore                              B. match                             C. chemical                         D. armchair

2.    A. mend                              B. semester                        C. letter                                D. report

3.    A. match                             B. pan                                 C. transmit                           D. safety

4.    A. knife                               B. socket                            C. desk                                 D. bookshelf

5.    A. head                               B. reading                          C. ready                               D. measure

II.Choose the word (A, B, C or D) that best completes the sentence.

1.    A: Can you help me carry my bags, please? B: -_________.

            A. Certainly                   B. Yes, I can                      C. Yes, please                     D. No, thanks

2.    I used to _________book before going to bed.

            A. read                           B. reading                          C. reads                                D. to read

 3.   Nam is not _________to be in my class.

            A. very old                    B. old enough                    C. too old                             D. enough old

4.    I’ll come and pick you up _________6:30 this evening, is it O.K?

            A. in                                B. at                                    C. on                                     D. to

5.    He is not _________to get married.

            A. enough old               B. enough young              C. old enough                      D. young enough

6.    Alexander Graham Bell was born_________3rd March, 1847.

            A. in                                B. on                                   C. at                                      D. during

7.    Would you like _________a message?

            A. to leave                     B. leave                              C. leaving                            D. left

8.    We must be there _________7.30 and 10.30.

            A. at                                B. before                            C. between                           D. after

9.    My father used _________us to the zoo when we were young.

            A. took                           B. taking                            C. to take                             D. take                           10.   Nam hates _________home alone.

            A. to live                        B. lives                               C. live                                   D. living

11.   My mother is _________tired _________cook tonight.

            A. enough/to                 B. too/ to                            C. so/ that                            D. very/ to

12.   She has _________over 30 pages since yesterday.

            A. writen                        B. wrote                             C. written                             D. write

13.   London is _________capital city in Europe.

            A. larger                         B. the largest                     C. most large                       D. large

14.   At the end of the film “Romeo and Juliet”, they killed _________.

            A. herself                       B. himself                          C. themselves                      D. ourselves

15.   Vietnamese is different _________English.          

            A. from                           B. as                                    C. like                                   D. with

III.Choose the words or phrases that needs correction.

1.     They (have lived) (in the country) (since) (ten years).

                       A                 B               C         D

2.      We (enjoy) (to go) (for a walk) (in the morning).

                  A        B          C                D

3.        Hoa (usually) (visits us) (in) (Sunday).

                     A         B         C     D

4.        Nam (must)(helps his mother) (do) (the housework).

                    A      B                                       C           D

5.        Airmail is (very) (expensive) (than) (surface mail).

                            A                 B             C          D

1
25 tháng 6 2021

 

I.Choose the word whose underlined is pronounced differently from that of the rest.

1.    A. chore                              B. match                             C. chemical                         D. armchair

2.    A. mend                              B. semester                        C. letter                                D. report

3.    A. match                             B. pan                                 C. transmit                           D. safety

4.    A. knife                               B. socket                            C. desk                                 D. bookshelf

5.    A. head                               B. reading                          C. ready                               D. measure

II.Choose the word (A, B, C or D) that best completes the sentence.

1.    A: Can you help me carry my bags, please? B: -_________.

            A. Certainly                   B. Yes, I can                      C. Yes, please                     D. No, thanks

2.    I used to _________book before going to bed.

            A. read                           B. reading                          C. reads                                D. to read

 3.   Nam is not _________to be in my class.

            A. very old                    B. old enough                    C. too old                             D. enough old

4.    I’ll come and pick you up _________6:30 this evening, is it O.K?

            A. in                                B. at                                    C. on                                     D. to

5.    He is not _________to get married.

            A. enough old               B. enough young              C. old enough                      D. young enough

6.    Alexander Graham Bell was born_________3rd March, 1847.

            A. in                                B. on                                   C. at                                      D. during

7.    Would you like _________a message?

            A. to leave                     B. leave                              C. leaving                            D. left

8.    We must be there _________7.30 and 10.30.

            A. at                                B. before                            C. between                           D. after

9.    My father used _________us to the zoo when we were young.

            A. took                           B. taking                            C. to take                             D. take                  

 10.   Nam hates _________home alone.

            A. to live                        B. lives                               C. live                                   D. living

11.   My mother is _________tired _________cook tonight.

            A. enough/to                 B. too/ to                            C. so/ that                            D. very/ to

12.   She has _________over 30 pages since yesterday.

            A. writen                        B. wrote                             C. written                             D. write

13.   London is _________capital city in Europe.

            A. larger                         B. the largest                     C. most large                       D. large

14.   At the end of the film “Romeo and Juliet”, they killed _________.

            A. herself                       B. himself                          C. themselves                      D. ourselves

15.   Vietnamese is different _________English.          

            A. from                           B. as                                    C. like                                   D. with

III.Choose the words or phrases that needs correction.

1.     They (have lived) (in the country) (since) (ten years).

                       A                 B               C         D

2.      We (enjoy) (to go) (for a walk) (in the morning).

                  A        B          C                D

3.        Hoa (usually) (visits us) (in) (Sunday).

                     A         B         C     D

4.        Nam (must)(helps his mother) (do) (the housework).

                    A      B                                       C           D

5.        Airmail is (very) (expensive) (than) (surface mail).

                            A                 B             C          D

24 tháng 11 2016

Đặt A=\(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}\)

A=\(\frac{1}{2\cdot2}+\frac{1}{3\cdot3}+\frac{1}{4\cdot4}+...+\frac{1}{100\cdot100}\)

A<\(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{99\cdot100}\)

A<\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)

A<\(1-\frac{1}{100}=\frac{99}{100}< 1\)

Vậy \(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< 1\)

24 tháng 11 2016

Ta có : \(\frac{1}{2^2}< \frac{1}{1.2};\frac{1}{3^2}< \frac{1}{2.3};\frac{1}{4^2}< \frac{1}{3.4};...;\frac{1}{100^2}< \frac{1}{99.100}\)

\(\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

Đặt : \(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

\(\Rightarrow A=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)

\(\Rightarrow A=\frac{1}{1}-\frac{1}{100}=\frac{99}{100}\)

Vì : \(A< 1\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< 1\)

Vậy ...

24 tháng 11 2016

Ta có :

\(\begin{cases}\frac{1}{2^2}< \frac{1}{1.2}\\\frac{1}{3^2}< \frac{1}{2.3}\\.....\\\frac{1}{100^2}< \frac{1}{99.100}\end{cases}\)

\(\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+....+\frac{1}{100^2}< \frac{1}{1.2}+\frac{1}{2.3}+....+\frac{1}{99.100}\)

\(\frac{1}{1.2}+\frac{1}{2.3}+....+\frac{1}{99.100}=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+....+\frac{1}{99}-\frac{1}{100}=1-\frac{1}{100}< 1\)

\(\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+....+\frac{1}{100^2}< 1\)

24 tháng 11 2016

Ta có: \(\frac{1}{2^2}< \frac{1}{1.2}\)

\(\frac{1}{3^2}< \frac{1}{2.3}\)

\(\frac{1}{4^2}< \frac{1}{3.4}\)

..........................

\(\frac{1}{100^2}=\frac{1}{99.100}\)

\(\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)

\(=1-\frac{1}{100}\)

\(1-\frac{1}{100}< 1\Rightarrow\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< 1\)

 

 

14 tháng 5 2022

giải chi tiết cho mình nhé

14 tháng 5 2022

các bạn làm cách giải chi tiết cho mình nhé