M3= 82 độ

Đáp án: `M_3 = 82^o`

HT!

1. My hobby is collecting glass bottles.

2. Van's brother usually rides to work.

3. What is her favourite activity.

4. Linh doesn't  playing board games.

Viết lại các câu sau

1.I find collecting glass bottles interesting

My hobby is...collecting glass bottles....

2.Van's brother usually goes to work by motorbike

Van'a brother usually rides...motorbike to work...

3.What hobby do you best,Lan?(favorite)

What...is your favorite hobby, lan?...

4.Linh finds playing boarding games boring(doesn't )

Linh......doesn't playing board games........

`9^12` và `26^8`

`9^12 = (9^3)^4 = 27^4`

`26^8 = (26^2)^4 = 676^4`

Do `27^4 < 676^4` nên `9^12 < 26^8`

HT!

9^12 > 26^18

Bài 6 :

a ) Từ \(\frac{x}{y}=\frac{6}{5}\)\(\Rightarrow\)\(\frac{x}{6}=\frac{y}{5}\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có :

\(\frac{x}{6}=\frac{y}{5}=\frac{x+y}{6+5}=\frac{121}{11}=11\)

\(\Rightarrow\hept{\begin{cases}\frac{x}{6}=11\\\frac{y}{5}=11\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=66\\y=55\end{cases}}\)

b ) Từ \(4x=5y\)\(\Rightarrow\)\(\frac{x}{5}=\frac{y}{4}\)

Đặt \(\frac{x}{5}=\frac{y}{4}=k\)

\(\Rightarrow\hept{\begin{cases}x=5k\\y=4k\end{cases}}\)

Thay vào ta có :

\(2.5k-5.4k=40\)

\(10k-20k=40\)

\(-10k=40\)

\(k=-4\)

\(\Rightarrow\hept{\begin{cases}x=5.\left(-4\right)=-20\\y=4.\left(-4\right)=-16\end{cases}}\)

Bạn đợi chút mình làm các phần còn lại cho ạ

c ) Đặt \(\frac{x}{3}=\frac{y}{16}=k\)

\(\Rightarrow\hept{\begin{cases}x=3k\\y=16k\end{cases}}\)

Thay vào ta có :

\(3k.16k=192\)

\(48.k^2=192\)

\(k^2=4\)

\(k^2=2^2\)hoặc \(\left(-2\right)^2\)

\(k=\pm2\)

+ ) Nếu \(k=2\)\(\Rightarrow\hept{\begin{cases}x=3.2=6\\y=16.2=32\end{cases}}\)

+ ) Nếu \(k=-2\)\(\Rightarrow\hept{\begin{cases}x=3.\left(-2\right)=-6\\y=16.\left(-2\right)=-32\end{cases}}\)

d ) Đặt \(\frac{x}{-3}=\frac{y}{7}=k\)

\(\Rightarrow\hept{\begin{cases}x=-3k\\y=7k\end{cases}}\)

Thay vào ta được :

\(\left(-3k\right)^2-\left(7k\right)^2=-360\)

\(\left(-3\right)^2.k^2-7^2.k^2=-360\)

\(9.k^2-49.k^2=-360\)

\(-40.k^2=-360\)

\(k^2=9\)

\(k^2=3^2\)hoặc \(\left(-3\right)^2\)

\(k=\pm3\)

+ ) Nếu \(k=3\)\(\Rightarrow\hept{\begin{cases}x=-3.3=-9\\y=7.3=21\end{cases}}\)

+ ) Nếu \(k=-3\)\(\Rightarrow\hept{\begin{cases}x=-3.\left(-3\right)=9\\y=7.\left(-3\right)=-21\end{cases}}\)

1.I find collecting glass bottles interesting. HObbY

-> Collecting glass bottles is my hobby.

2.Van's brother usually goes to work by motorbike. RIDES

-> Van's brother usually rides his motorbike to work.

​

3. What hobby do you best, Elina? FAVOURITE

 What is your favorite hobby, Elina?

4. Linh finds playing board games boring.

. Linh doesn't interested in playing board games.

5. My sister enjoys arranging flowers. FINDS

. My sister finds arranging flowers enjoyable.

https://www.google.com/search?q=A%3D(-1%2F3)%5E2%3A1%2F6-2*(-1%2F2)%5E3&oq=A%3D(-1%2F3)%5E2%3A1%2F6-2*(-1%2F2)%5E3&aqs=chrome..69i57.197j0j4&sourceid=chrome&ie=UTF-8

https://h7.net/hoi-dap/toan-6/tim-x-biet-2-1-2x-1-3-3-2-1-4-faq373033.html

tham khảo nhé bn

A= 29 phần 108

B= 59 phần 180

TL

1. carve => carving

2. not goes => doesn`t go

3. take => took

4. interest => is interesting

5. played => will play

^HT^

trả lời :

k mk nhé
 

^HT^