3. That car's so expensive, I don’t think I can buy it.
It's such an expensive car that i don't i can buy it

It's such a expensive car that I can't buy it

My English friend finds using chopsks difficult.
My English friend isn't easy to use chopsks.

Hok tốt !

 My English friends isn't used to using chopsks.

Chúc cậu học tốt!

Kb nha!

During the teacher's absence, the class was very noisy.

=> While the teacher was absent, the class was very noisy.

Học tốt!!!

Chimai:3

10. The builder is going to mend my roof tomorrow.

I am going to have my roof ment by the builder tomorrow .

11. I am sorry I sent you that letter. It was very rude of me.

I regret sending you that letter.It was very rude of me.

13. He is so dull that people fall asleep while he is talking.

He is such a dull person that people fall asleep while he is talking.

14. My English friend finds using chopsks difficult.

My English friend isn't used to using chopsks.

15. That car's so expensive, I don’t think I can buy it.

It's such an expensive car that i don't think i can buy it.

If you don't pay me the money you took,I will tell the police.

https://olm.vn/thanhvien/hamnguhamchoi nó là thằng bò ấy mà

11.  The water in this lake is rather ................, sea water.            ( salt) SALTY

12.   The.............of his wife was a great blow to him.                         ( lose) LOSS

13.  We`ll...........our room with some roses                                         (beauty) BEAUTIFY

14.  Trung's sense of humor ..........him from other students.               ( distinct) 

15.  The homemade ice-cream ...........after it had been in the freezer for an hour. (hard)

16.  Where is the ............to his shopping centre?                                (enter) ENTRANCE

17.  There's no easy .............to this problem                                        (solve) SOLUTION

18.  Don’t be so...............; we've only been waiting for a few minutes.         (patient) IMPATIENT

19.  In ancient Greece, the owl was a symbol of ............                    (wise) WISEDOM 

Câu hỏi của sjfdksfdkjlsjlfkdjdkfsl - Toán lớp 7 - Học toán với OnlineMath

Em tham khảo!

P/ s: số xấu quá ạ

Ta có: \(\frac{x}{-2}=\frac{y}{3}\Leftrightarrow\frac{x^2}{4}=\frac{y^2}{9}\)

Áp dụng tính chất của dãy tỉ số bằng nhau:

\(\Rightarrow\frac{x^2}{4}=\frac{y^2}{9}=\frac{x^2+y^2}{4+9^2}=\frac{19}{13}\)

\(\Leftrightarrow\hept{\begin{cases}\frac{x^2}{4}=\frac{19}{13}\\\frac{y^2}{9}=\frac{19}{13}\end{cases}\Leftrightarrow\hept{\begin{cases}x^2=\frac{76}{13}\\y^2=\frac{171}{13}\end{cases}}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\sqrt{\frac{76}{13}}\\x=-\sqrt{\frac{76}{13}}\end{cases}}\) và \(\orbr{\begin{cases}y=\sqrt{\frac{171}{13}}\\y=-\sqrt{\frac{171}{13}}\end{cases}}\)

Vì viết cả ngoặc đồng thời nữa thì không hiện ra nên tách riêng ra = "và" nên trong vở a/ c viết ngoặc đồng thời vào ạ :))

Đặt k

Đặt \(\frac{x}{-2}=\frac{y}{3}=k\)

\(\Rightarrow x=-2k;y=3k\)

\(x^2+y^2=19\)

\(\Leftrightarrow4k^2+9k^2=19\)

\(\Leftrightarrow13k^2=19\)

\(\Leftrightarrow k^2=\frac{19}{13}\)

Giống như bạn kia,nghiệm xấu