Tổng số phần bằng nhau là:

               3 + 1 = 4 (phần)

Số lớn là:

               3 : 4 x 3 = 2,25

Số bé là:

               3 - 2,25 = 0,75 

                        Đáp số : 2,25 và 0,75

1. It's nine o'clock on Sunday morning, I (stay) stay at home. I (read) read a novel and my sister (play) play computer games

  2. In Viet Nam, there (be) is no lessons on Saturday and Sunday.

  3. We cannot go out now. It (rain) raining heavily outside.

  4. Where's the dog? It (have) is having its meal now

Cho dd X gồm: 0,007 mol Na⁺; 0,003 mol Ca²⁺; 0,006 mol Cl^–; 0,006 mol HCO₃^– và 0,001 mol NO₃^-. Để loại bỏ hết Ca²⁺ trong X cần một lượng vừa đủ dd chứa a gam Ca(OH)₂. Giá trị của a là 

A. 0,180.

B. 0,120

C. 0,444.

D. 0,222.

x.2=4/11.11/9

x.2=4/9

x   = 4/9:2

x   = 4/(9.2)

x   = 4/18=2/9

Ta có: \(\frac{a}{b}< \frac{a+1}{b+1}\)

\(B=\frac{10^{2013}+1}{10^{2014}+1}< \frac{10^{2013}+1+9}{10^{2014}+1+9}=\frac{10^{2013}+10}{10^{2014}+10}=\frac{10\left(10^{2012}+1\right)}{10\left(10^{2013}+1\right)}=\frac{10^{2012}+1}{2^{2013}+1}=A\)

Vậy: \(A>B\)

Duy nèo ây =))

Viết lại câu sao cho nghĩa không đổi:

1.My father started working in this factory last week.

=>My father has worked in this factory since last week.

2.He started living in HCM City when he was 2.

=>He has lived in HCN since he was 2.

3.He learned English when he was 18.

=>He has learned English since he was 18.

4.They began to work in this factory five years old.

=>They have worked in this factory for five years.

5.My father stopped smoking two years ago.

=>My father hasn't smoked for two years.

6.My sister started working in that school last month.

=>My sister has worked in that school since last month.

7.They have worked in that company since 2000.

=>They started working in that company in 2000.

8.Minh hasn't visited Ha Long Bay before.

=>This is the first time Minh has ever visited Ha Long Bay.

1. I’m reading a book about history of China.
2. The shirt looked beautiful. I tried it on but it didn’t fit.
3. It is far from your house to the school.
4. Is Tokyo the biggest city in the world.
5. John’s worried about his final exam.
6. Are you interested in Math.
7. What’s HCM city famous for ?
8. Her sister is working for a computer company.
9. Can I talk to you for a moment?
10. My aunt sliced the beef into thin strips.

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