M = \(\sqrt{5.20}-\sqrt{5.3}+\sqrt{45}=\sqrt{100}-\sqrt{45}+\sqrt{45}=\sqrt{100}=10\)

1. C

2.A

3.A

4.C

5.D

6.A

thị giác, thính giác

2100 vòng

Ảnh luôn lớn hơn vật nha

7.Tuan asked Ba if his sister was fond of Tom and Jerry

1. She asked me if I liked playing games on the Internet.

2. She asked her brother if he had found the key the previous night.

3. The tourist asked me if there was a post office near there.

4.The examiner asked Hoa if she could speak French.

5. Alan asked Scott if he would be there for next Sunday.

6.Tim asked Lily if her mother went to work by bus.

\(=\dfrac{1}{2}.\left(\dfrac{2}{2.4}+\dfrac{2}{4.6}+\dfrac{2}{6.8}+....+\dfrac{2}{98.100}\right)=\dfrac{1}{2}.\left(\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{6}+\dfrac{1}{6}-...-\dfrac{1}{100}\right)=\dfrac{1}{2}.\left(\dfrac{1}{2}-\dfrac{1}{100}\right)=\dfrac{1}{2}.\dfrac{49}{100}=\dfrac{49}{200}\)

the ruler is yellow

theo như mình thấy thì câu b giống hệt câu a