Lan là bạn thân nhất của em từ khi e học lớp một đến giờ. Bạn ấy không những là một cô gái xinh xắn mà bạn ấy còn là một người học rất giỏi, Lan không chỉ được bạn bè yêu mến mà bạn ấy cũng nhận được sự hài lòng rất nhiều từ phía các thầy cô. Lan thật sự là một người bạn tốt. Bạn ấy luôn chia sẻ cùng em những niềm vui và nỗi buồn của bạn ấy. Bạn ấy cũng luôn giúp đỡ em mỗi khi em gặp khó khăn. Em quý bạn ấy lắm. Em mong rằng tình bạn giữa em và bạn ấy sẽ kéo dài mãi mãi.

\(C=\frac{1}{2}+\frac{1}{14}+\frac{1}{35}+\frac{1}{65}+\frac{1}{104}+\frac{1}{152}\)

\(C=\frac{2}{4}+\frac{2}{28}+\frac{2}{70}+\frac{2}{130}+\frac{2}{208}+\frac{2}{304}\)

\(C=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+\frac{2}{10.13}+\frac{2}{13.16}+\frac{2}{16.19}\)

\(C=\frac{2}{3}.\left(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+\frac{3}{13.16}+\frac{3}{16.19}\right)\)

\(C=\frac{2}{3}.\left(3-\frac{3}{4}+\frac{3}{4}-\frac{3}{7}+\frac{3}{7}-\frac{3}{10}+\frac{3}{10}-\frac{3}{13}+\frac{3}{13}-\frac{3}{16}+\frac{3}{16}-\frac{3}{19}\right)\)

\(C=\frac{2}{3}.\left(3-\frac{3}{19}\right)\)

\(C=\frac{2}{3}.\frac{54}{19}\)

\(C=\frac{36}{19}\)

mk sai bước cuối

\(C=\frac{2}{3}.\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+\frac{1}{13}-\frac{1}{16}+\frac{1}{16}-\frac{1}{19}\right)\)

\(C=\frac{2}{3}.\left(1-\frac{1}{19}\right)\)

\(C=\frac{2}{3}.\frac{18}{19}\)

\(C=\frac{12}{19}\)

Ta có: \(\frac{a}{b}< \frac{c}{d}\Leftrightarrow ad< bc\)

\(\Leftrightarrow2018ad< 2018bc\)

\(\Leftrightarrow2018ad+cd< 2018bc+cd\)

\(\Leftrightarrow d\left(2018a+c\right)< c\left(2018b+d\right)\)

\(\Leftrightarrow\frac{2018a+c}{2018b+d}< \frac{c}{d}\left(đpcm\right)\)

ta có a/b < c/d 

=> ad<bc 

=> 2018ad < 2018bc

=> 2018ad + cd < 2018bc + cd 

=> ( 2018 a + c ) < c ( 2018 b + d )

=> \(\frac{2018a+c}{2018b+d}< \frac{c}{d}\left(\text{đ}pcm\right)\)

1. We're going to play soccer match tomorrow.

=> a soccer match

2. What about going and see our teachers this afternoon?

=> seeing

3. Why not we go to the cinema.

=> don't

4. My parents are going to buy for me a new bike next week.

=> Ko điền gì

5. Lan often helps her mother does the housework in her free time.

=> with

1. We're going to play soccer match tomorrow.

\(\Rightarrow\) We're going to play soccer tomorrow.

2. What about going and see our teachers this afternoon?

\(\Rightarrow\) What about going and seeing our teachers this afternoon?

3. Why not we go to the cinema?

\(\Rightarrow\)Why don't we go to the cinema?

4. My parents are going to buy for me a new bike next week.

\(\Rightarrow\)My parents are going to buy me a new bike next week.

5. Lan often helps her mother does the housework in her free time.

\(\Rightarrow\)Lan often helps her mother with the housework in her free time.

1. You / Hoa / visit / our teachers? - Yes

=> Are you and Hoa going to visit our teachers ? Yes , we are

2. How long / your uncle / stay / Huế? - He / 2days.

=> How long is your uncle going to stay in Hue ? He is going to stay there for about 2 days

3. How / children / go /beach? - They / bu

=> " bu " ???????

4. Miss Hoa / teach / us / literature / next term? - Yes

=> Is Miss Hoa going to teach us literature next term ? Yes , she is

5. What / you / be ? - teacher / grow up.

=> What are you going to be when you grow up ? I am going to be a teacher when I grow up

1. Are you and Hoa going to visit our teachers? Yes, we are.

2. How long is your uncle going to stay in Hue? He is going to stay in Hue for 2 days.

3. How are children going to beach? They are going to beach by bus.

4. Is Miss Hoa going to teach us literature in next term? Yes, she is.

5. What are you going to be? I am going to a teacher when I grow up.

a. \(\frac{3}{5}+x=\frac{5}{6}\)

=> \(x=\frac{5}{6}-\frac{3}{5}\)

=> \(x=\frac{7}{30}\)

b. \(\left(3\frac{1}{2}+2x\right).\frac{8}{3}=\frac{16}{3}\)

=> \(3\frac{1}{2}+2x=\frac{16}{3}:\frac{8}{3}=2\)

=> \(2x=2-3\frac{1}{2}=2-\frac{7}{2}=-\frac{3}{2}\)

=> \(x=-\frac{3}{2}:2\)

=> \(x=-\frac{3}{4}\)

\(A=\frac{1}{4}:\left(10,3-9,8\right)-\frac{3}{4}\)

\(A=\frac{1}{4}:\left(0,5\right)-\frac{3}{4}\)

\(A=\frac{1}{4}:\frac{1}{2}-\frac{3}{4}\)

\(A=\frac{1}{4}\cdot2-\frac{3}{4}=\frac{1}{2}-\frac{3}{4}=\frac{2}{4}-\frac{3}{4}=\frac{-1}{4}\)

Bài 1:

a, \(A=\frac{1}{4}:0,5-\frac{3}{4}\)

       \(=\frac{1}{2}-\frac{3}{4}\)

         \(=\frac{-1}{4}\)

b, \(B=\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)

       \(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}\)

       \(=\frac{6}{7}+\frac{-5}{8}\)

       \(=\frac{13}{56}\)

Hk tốt

1. Is that your room ?                                                                 1. Is this her flower garden ?

2. Is that her hat ?                                                                       2. Is this their house ?

3. Is that his bike ?                                                                     3. Is this his cat ?

4. Is that their dog ?                                                                   4. Is this your pen ?

5. Is that your car ?                                                                    5. Is this her pencil case ?

Trả lời: mk k bít

Ukm k sao đâu, mk cũng từ nghĩ ra cách làm rồi

\(34\%:\frac{51}{16}-\frac{34}{9}:6,5-\left(0,4\right)^2\)

\(=\frac{34}{100}:\frac{51}{16}-\frac{34}{9}:\frac{65}{10}-0,16\)

\(=\frac{34\cdot16}{100\cdot51}-\frac{34\cdot10}{9\cdot65}-\frac{16}{100}\)

\(=\frac{2\cdot17\cdot4\cdot4}{4\cdot5\cdot5\cdot17\cdot3}-\frac{2\cdot17\cdot2\cdot5}{3\cdot3\cdot5\cdot13}-\frac{4}{25}\)

\(=\frac{8}{75}-\frac{34}{117}-\frac{4}{25}=\left(\frac{8}{75}-\frac{4}{25}\right)-\frac{34}{117}\)

\(=\left(\frac{8}{75}-\frac{12}{75}\right)-\frac{34}{117}=\frac{-4}{75}-\frac{34}{117}\)

\(34\%\div\frac{51}{16}-\frac{34}{9}\div\frac{6}{5}-\left(0,4\right)^2\)

\(=\frac{34}{100}\times\frac{16}{51}-\frac{34}{9}\times\frac{5}{6}-0,16\)

\(=\frac{17}{50}\times\frac{16}{51}-\frac{85}{27}-\frac{16}{100}\)

\(=\frac{8}{75}-\frac{85}{27}-\frac{4}{25}\)

\(=\frac{8}{75}-\frac{85}{27}-\frac{12}{75}\)

\(=\frac{-4}{75}-\frac{85}{27}\)

\(=\frac{-108}{2025}-\frac{6375}{2025}\)

\(=\frac{-6483}{2025}\)