1. Nick washes his hands a lot, so he doesn't have the flu.

2. David eats lots of junk food, and he doesn't do exercise.

3. Elena should sleeps more, or she should try to relax more.

4. My sister plays computer games, but she does exercise too.

5. Eating carrots will help you see better at night.

6. Going outside with wet hair will give you a cold or flu.

7. Eating fresh fish will make you smarter.

8. When you go outside with wet hair, it can make you get a cold or flu.

9. You should eat fresh fish, it can make you smarter.

10. You should eat carrots, it can help you see at night clearly.

Chúc bạn học tốt

Sửa câu c: 

c) \(x:\left(34-24,7\right)=207\)

\(x:9,3=207\)

\(x=207\times9,3\)

\(x=1925,1\)

Nãy mik nhìn nhầm.

Tìm x: 

a) \(x:\left(8,4+16,6\right)=1,8\times3\)

\(x:\left(8,4+16,6\right)=5,4\)

\(x:25=5,4\)

\(x=5,4\times25\)

\(x=135\)

b) \(x:\left(91,5-83,6\right)=45\)

\(x:7,9=45\)

\(x=45\times7,9\)

\(x=355,5\)

c) \(x:\left(34-24,7\right)=207\)

\(x:9,3=107\)

\(x=107\times9,3\)

\(x=995,1\)

My friend, Han, can't eat shrimps. She has an sore throat.

\(B=\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+...+\dfrac{1}{90}\)

\(=\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{9.10}\)

\(=\left(1-\dfrac{1}{2}\right)+\left(\dfrac{1}{2}-\dfrac{1}{3}\right)+\left(\dfrac{1}{3}-\dfrac{1}{4}\right)+...+\left(\dfrac{1}{9}-\dfrac{1}{10}\right)\)

\(=\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{9}-\dfrac{1}{10}\right)\)

\(=\left(1-\dfrac{1}{10}\right)\)

\(=\left(\dfrac{10}{10}-\dfrac{1}{10}\right)\)

\(=\dfrac{9}{10}\)

Chúc bạn học tốt

Nếu là thì hiện tại tiếp diễn thì: Bạn thêm tobe vào câu ( is / am / are ) theo từ đã cho. 

+) He / she / it → is + Ving

+) I → am + Ving

+) They / We / You → are + Ving

⇒ He is going to the school.

Chúc bạn học tốt

\(58,7\times9,1-12,4\times58,7+3,3\times58,7\)

\(=58,7\times\left(9,1-12,4+3,3\right)\)

\(=58,7\times0\)

\(=0\)

Chúc bạn học tốt

\(745-x=304\)

          \(x=745-304\)

          \(x=441\)

\(x+\dfrac{1}{10}+x+\dfrac{1}{11}=x+\dfrac{1}{21}\)

\(x+x-x=\dfrac{1}{21}-\dfrac{1}{10}-\dfrac{1}{11}\)

\(x=\dfrac{-11}{210}-\dfrac{1}{11}\)

\(x=\dfrac{-331}{2310}\)

Từ chỉ sự vật: Sân trường, thư viện, sách, báo.

Từ chỉ đặc điểm: vòm cây rợp mát, bắt mắt yêu thương, tươi đẹp.

Từ chỉ hoạt động: chạy ùa, gặp lại, bước ra, dặt.