các bạn giúp mình bài 4 nhé. cảm ơn các bn nhiều

các bạn ơi giúp mình với ạ 

các bn ơi 

mn ơi cần gấpppppp

T^T

She is nice ?                                                   the children are in their class now

They don't are students.                                Are they workers ? No , they aren't

He is fine today                                                các câu còn lại thì tự làm !!

My brother doesn't is a doctor         

nooooo mik làm đến câu 7 r mak ấn nhầm h lại phải vieetsl ại hừ hừ dcmmmmmmmmmmmmmmmmmmmmmmmmm cuộc đời

b: Đặt \(\dfrac{a}{b}=\dfrac{c}{d}=k\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=bk\\c=dk\end{matrix}\right.\)

Ta có: \(\dfrac{\left(a+c\right)^2}{\left(b+d\right)^2}\)

\(=\dfrac{\left(bk+dk\right)^2}{\left(b+d\right)^2}\)

\(=k^2\)(1)

Ta có: \(\dfrac{a^2-c^2}{b^2-d^2}\)

\(=\dfrac{\left(bk\right)^2-\left(dk\right)^2}{b^2-d^2}\)

\(=k^2\left(2\right)\)

Từ (1) và (2) suy ra \(\dfrac{\left(a+c\right)^2}{\left(b+d\right)^2}=\dfrac{a^2-c^2}{b^2-d^2}\)

Đặt \(\dfrac{a}{b}=\dfrac{c}{d}=k\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=bk\\c=dk\end{matrix}\right.\)

Ta có: \(\dfrac{4a+3c}{4b+3d}=\dfrac{4bk+3dk}{4b+3d}=k\)

\(\dfrac{4a-3c}{4b-3d}=\dfrac{4bk-3dk}{4b-3d}=k\)

Do đó: \(\dfrac{4a+3c}{4b+3d}=\dfrac{4a-3c}{4b-3d}\)​

? Tiếng gì đây , giống tiếng Trung quá ta

;-; :)?? 😞🤘🏻 :v

ex 4.

1 seeing

2 to pay

3 sneezing

4 to clean up

5 to work

6 cutting

7 to iron - ironing

8 driving

9 to have

10 to invite

11 being

12 to find

13 holding - drinking

14 to repair

15 explaining

ex 5.

2. Pamela continued dancing for an hour.

3. I'd rather sit in the front row.

4. Richard expects to do well.

5. What do you intend to do for the summer?

6. I hate clearing up my room.

7. Helen agreed to go to the party with me.

8. My boss refused to let me leave early.

9. I really look forward to hearing from you soon.

10. What do you want to do this evening?

11. The manager promised to speak to you about this.

12. Fiona succeeded in persuading her father to change his mind.

13. Where do you feel like going this evening?

14. The detective happened to discover the secret.

15. It was very late, but she went on tidying up the kitchen.

ex6.

1. The room will be cleaned today.

2. The car might be stolen.

3. That tree had to be cut down.

4. The old houses are going to be demolished.

5. The picture can't be restored.

6. An appointment must be made in advance.

7. I don't want to be made a fool.

8. The garden has to be looked after.

9. He wants to be served.

10. He is going to be interviewed next week.

11 My sister walks to school

12 The bank is near the post office

13 Our garden has many flowers

14 Ba doesn't like Math

15 Nam doesn't live in the countryside

11. My sister walks to school
12. The bank is near the post office
13. Our garden has many flowers
14. Ba doesn't like Math best
15. Nam doesn't live in the country

uses crt;

var st:array[1..100]of string;

a,b,c:array[1..100]of real;

i,n:integer;

max:real;

begin

clrscr;

readln(n);

for i:=1 to n do readln(st[i],a[i],b[i],c[i]);

max=(a[1]+b[1]+c[1])/3;

for i:=1 to n do 

if (max<(a[i]+b[i]+c[i])/3) then max:=(a[i]+b[i]+c[i])/3;

writeln(max:4:2);

readln;

end.