Nửa chu vi mảnh đất là :

       120 : 2 = 60 ( m )

Chiều dài mảnh đất là :

     ( 60 + 10 ) : 2 = 35 ( m )

Chiều rộng mảnh đất là :

      35 + 10 = 45 ( m )

Diện tích mảnh đất là :

      45 * 35 = 1575 ( m2 )

               Đáp số : 1575 m2

1.Will you (be)..be...free next Sunday morning,Tan?

-No,I and my brother (visit)..will visit.....our grandmother

2.Wuold you like(have)....to have..brekfast with eggs and chicken?

3. Trang (not be ) ....is not.... in her room at the momnet . She (cook) ..is cooking....in the kitchen

4. She should ( bring )...bring......an English dictionary.

5. Lien ( not go ) ....will not go...... to the movie theater tomorrow. She ( stay) ..will stay.......at home and ( watch )...watch...TV

6. Do you( like ) ....like.... your new school Mai ?

7. Mai ( want ) ....wants....( buy ) ..to buy.... a new pencil

8. I hope my school team ( win ) ...will win.... next week

9. Mr Tu(not come )...wil not come....next month

10.Tracy always ( go) .....goes... out to have dinner, but to day she ( have)...is has.....with her friends at home

1 I (watch) .........am watching...........televison now

2 He (listen) ..........listens...............to music

3 We (not play) .........do not play..............volleyball

4 Nga and Hoa (not do) ........do not do...........the house work

5 Do you (read0 ......read......... the book?

6 Does your borther (wash) .....wash........... his face?

7 What the  are childrer (do).......doing.......in the yard?

8 Where does Mr Minh ......work...............(work)

9 How your does father (travel)..........travel.......to work?

10 Hoa (not drive)........does not do............. a car

ngất

Gọi số học sinh 4 khối lần lượt là a;b;c;d

\(\Rightarrow\frac{a}{9}=\frac{b}{8}=\frac{c}{7}=\frac{d}{6}\)

Áp dụng tc của dãy tỉ số bằng nhau . TA có

\(\frac{a}{9}=\frac{b}{8}=\frac{c}{7}=\frac{d}{6}=\frac{b-d}{8-6}=\frac{70}{2}=35\)

\(\Rightarrow\begin{cases}a=315\\b=280\\c=245\\d=210\end{cases}\)

Vậy số học sinh 4 khối lần lượ là 315 ; 280 ; 245 ;210

Cho mình sửa nhé

\(\frac{2n-1}{3n-4}\in Z\)

<=> 2n - 1 chia hết cho 3n - 4

<=> 3(2n - 1) - 2(3n - 4) chia hết cho 3n - 4

<=> 6n - 3 - 6n + 4 chia hết cho 3n - 4

<=> 1 chia hết cho 3n - 4

\(\Leftrightarrow3n-4\inƯ_1\)

\(\Leftrightarrow3n-4\in\left\{1;-1\right\}\)

\(\Leftrightarrow n\in\left\{\frac{5}{3};1\right\}\)

Mà n là số nguyên

=> n=1

\(\left(x-1\right)^2=121\)

\(\Rightarrow\left[\begin{array}{nghiempt}x-1=11\\x-1=-11\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=12\\x=-10\end{array}\right.\)

Vậy \(x=\left\{12;-10\right\}\)