Don't call me again at this late hour, please ? She said.

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

\(\frac{x}{3}=\frac{11}{21}\)

\(x=\frac{11.3}{21}\)(Áp dụng công thức \(\frac{a}{b}=\frac{c}{d}\)khi \(a.d=b.c\))

\(\Rightarrow x=\frac{11}{7}\)

~Học tốt~

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

\(\frac{x}{3}=\frac{2.7+\left(-1\right).3}{21}\)

\(\frac{x}{3}=\frac{11}{21}\)

\(\Leftrightarrow21x=33\)

\(\Leftrightarrow x=\frac{33}{21}=\frac{11}{7}\)

576+789+467+111=1943

k cho mk nha mn THANK YOU !

Do n+3\(⋮\)n+3 (*) => (n+3)²\(⋮\)n+3 hay n²+6n+9\(⋮\)n+3

=> n²+6n+9-(n²-7)\(⋮\)n+3 hay 6n+16\(⋮\)n+3

Từ (*) => 6n+18\(⋮\)n+3

=> 6n+18-(6n+16)\(⋮\)n+3 hay 2\(⋮\)n+3

=> n+3 \(\in\){-2;-1;1;2}

Vậy n \(\in\){1;2;4;5}

Ta có: \(n^2-7⋮n+3\Leftrightarrow n^2-9+2⋮n+3\Leftrightarrow\left(n-3\right)\left(n+3\right)+2⋮n+3\)

\(\Rightarrow\)\(2⋮n+3\)

Vậy n+3 là Ước của 2

Ta có bảng sau: 

Vậy n=....

write rồi nha

ahihi

ai xin k 1 cái cho lên top 20 nha

Phân tích hình ảnh thầy giáo Ha-men trong truyện:

- Thầy Ha-men dạy buổi học cuối cùng bằng tiếng Pháp trước khi rời đi mãi mãi.

- Diện mạo bên ngoài của thầy (bộ trang phục đẹp thường mặc vào dịp long trọng: mặc bộ rơ-đanh-gốt, cổ diềm lá sen,…)

- Thái độ dịu dàng khác hẳn ngày thường.

- Giọng nói nghẹn ngào, thiết tha khi bày tỏ cảm xúc đau buồn vì học sinh không được học ngôn ngữ dân tộc; sôi nổi khi khẳng định vẻ đẹp của tiếng nói dân tộc; nỗi xúc động tột cùng trong giây phút cuối,…

- Hành động bất ngờ khi viết lên bảng: “NƯỚC PHÁP MUÔN NĂM!”.

Những chi tiết miêu tả thầy giáo ha-men trong buổi học cuối cùng:

- Trang phục: Thầy mặc bộ lễ phục chỉ dùng vào những ngày đặc biệt khi có thanh tra hoặc phát thưởng: áo rơ-đanh-gốt màu xanh lục diềm lá sen gấp nếp mịn và đội mũ tròn bằng lụa đen thêu.

- Thái độ đối với học sinh: dịu dàng, không giận dữ quát mắng; kiên nhẫn giảng bài, chuẩn bị bài học rất chu đáo.

- Những lời nói về việc học tiếng Pháp: ca ngợi tiếng Pháp, tự phê bình mình và mọi người có lúc đã sao nhãng việc học tập và dạy tiếng Pháp. Thầy coi tiếng Pháp là vũ khí, là chìa khóa của chốn lao tù.

- Hành động, cử chỉ lúc buổi học kết thúc: thầy xúc động mạnh, người tái nhợt, nghẹn ngào, không nói được hết câu, nhưng thầy đã dồn hết sức mạnh để viết lên bảng dòng chữ thật to: "Nước Pháp muôn năm".

- Câu nói của thầy Ha- men đã nêu bật giá trị thiêng liêng và sức mạnh to lớn của tiếng nói dân tộc trong cuộc đấu tranh giành độc lập tự do. Tiếng nói của dân tộc được hình thành và vun đắp bằng sự sáng tạo cùa bao thế hệ qua hàng ngàn năm, là thứ tài sản vô cùng quý báu của mỗi dân tộc. Vì vậy phải biết yêu quý giữ gìn và học tập để nắm vững tiếng nói cùa dân tộc mình, nhất là khi đất nước rơi vào vòng nô lệ, bởi tiếng nói không chi là tài sản quý báu của dân tộc mà nó còn là phương tiện quan trọng để đấu tranh giành lại độc lập, tự do.

Chi tiết miêu tả thầy Ha - men : Thầy mặc bộ lễ phục chỉ dùng vào những ngày đặc biệt khi có thanh tra hoặc phát thưởng: áo rơ-đanh-gốt màu xanh lục diềm lá sen gấp nếp mịn và đội mũ tròn bằng lụa đen thêu.

Những lời nói về việc học tiếng Pháp của thầy Ha - men : ca ngợi tiếng Pháp, tự phê bình mình và mọi người có lúc đã sao nhãng việc học tập và dạy tiếng Pháp. Thầy coi tiếng Pháp là vũ khí, là chìa khóa của chốn lao tù.

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ak nhầm

gọi số hs lớp 7a 

chịu

*\(M+\left(5x^2-2xy\right)=6x^2+9xy-y^2\)

\(M=6x^2+9xy-y^2-\left(5x^2-2xy\right)\)

\(M=6x^2+9xy-y^2-5x^2+2xy\)

\(M=\left(6-5\right)x^2+\left(9+2\right)xy-y^2\)

\(M=x^2+11xy-y^2\)

* \(\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}\le0\)

Ta có : \(\hept{\begin{cases}\left(2x-5\right)^{2018}\ge0\forall x\\\left(3y+4\right)^{2020}\ge0\forall y\end{cases}\Rightarrow}\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}\ge0\forall x,y\)

Mà đề cho \(\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}\le0\)

=> \(\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}=0\)

=> \(\hept{\begin{cases}2x-5=0\\3y+4=0\end{cases}\Rightarrow}\hept{\begin{cases}x=\frac{5}{2}\\y=-\frac{4}{3}\end{cases}}\)

Thay x = 5/2 ; y = -4/3 vào M ta được :

\(M=\left(\frac{5}{2}\right)^2+11\cdot\frac{5}{2}\cdot\left(-\frac{4}{3}\right)-\left(-\frac{4}{3}\right)^2\)

\(M=\frac{25}{4}+\frac{-110}{3}-\frac{16}{9}\)

\(M=\frac{-1159}{36}\)

Vậy giá trị của M = -1159/36 khi x = 5/2 ; y = -4/3

Không chắc nha 

II

2 They haven't just had lunch with their friends

Have they just had lunch with their friends?

3 Many students didn't catch flu since last month

Did many students catch flu since last month

4 They didn't travel to Nha Trang last summer holliday

Did they travel to Nha Trang last summer holliday

5 Catherine hasn't already applied for the job

Has Catherine already applied for the job

6 They haven't ever climbed up the mountain twice

Have they ever climbed up the mountain twice