Cho \(A=\frac{1,11+0,19-1,3.2}{2,06+0,54}-\left(\frac{1}{2}+\frac{1}{3}\right):2\)

\(B=\left(5\frac{7}{8}-2\frac{1}{4}-0,5\right):2\frac{23}{26}\)

a) Rút gọn A và B

b) Tìm x thuộc Z để A<x<B

\(\frac{x}{5}=\frac{y}{6}\) <=> \(\frac{x}{10}=\frac{y}{12}\)

\(\frac{y}{4}=\frac{z}{8}\) <=> \(\frac{y}{12}=\frac{z}{24}\)

=> \(\frac{x}{10}=\frac{y}{12}=\frac{z}{24}\) <=> \(\frac{2x}{20}=\frac{3y}{36}=\frac{z}{24}\)

Áp dụng tính chất của dãy ta có:

\(\frac{2x}{20}=\frac{3y}{36}=\frac{z}{24}=\frac{2x+3y-z}{20+36-24}=\frac{36}{32}=\frac{9}{8}\)

=> \(x=\frac{9}{8}.20:2=\frac{45}{4}\)

=> \(y=\frac{9}{8}.36:3=\frac{27}{2}\)

=> \(z=\frac{9}{8}.24=27\)

2600+x:4=3845
x:4=3845-2600
x:4=1245
x=1245.4
x=4980

1) Our house has yard

=> My house doesn't have yard

2) There is a park near the hotel

=> There isn't a house near a lake

3) She lives in a house near a lake

=> She doesn't live in a house near a lake

4) Her brother and sister play sports after lunch

=> Her brother and sister don't play sports after lunch

Sửa câu 3: Do you usually go shopping?

1. Peter and Mary never come to class on time

2. Why doesn't Johnson always get good marks?

3. You usually go shopping

4. She seldom cries.

5. My father never has popcorn

1.My vacation in Nha Trang was wonderful. (gạch dưới wonderful)

=> How was your vacation in Nha Trang?

2.The summer vacation last for almost three months.( gạch dưới for almost three months)

=> How long was the summer vacation ?

Come to chỗ đổi ảnh hiển thị. Then change ảnh hiển thị. Finally, Perfect

1. They studies math

2. Why not she live him?

3. Will your father stayed in Ho Chi Minh City?

a) I went to Hanoi tonight

=> will go

b) She is going to playing tennis

=> play

c) My mother will cooking

=> is

d) The bird flys fast

=> flies

e) My father does watch tv now 

=> is watching

Chia động từ 

I(meet) will meet you soon