7 dm 5 cm = 7,5 dm

7dm 5cm = 7dm + 0,5dm = 7,5dm

lớp 8 thì chịu :|

:))

Dịch: Câu đố. Anh ấy đang nghe một bài thánh ca. Họ đang chơi trò chơi ô chữ. Anh ấy đang chơi trò chơi ô chữ.

`-5/7*2/11+9/7*(-5)/11+5/7`

`=-5/7*2/11+(-5)/7*9/11+5/7`

`=(-5/7)*2/11+(-5)/7*9/11+(-5/7)*(-1)`

`=(-5)/7*(2/11+9/11-1)`

`=(-5)/7*(11/11-1)`

`=(-5)/7*(1-1)`

`=(-5)/7*0`

`=0`

\(-\frac57.\frac{2}{11}+\frac97.\left(-\frac{5}{11}\right)+\frac57\)

\(=-\frac{10}{77}-\frac{45}{77}+\frac57\)

\(=-\frac{10}{77}-\frac{45}{77}+\frac{55}{77}\)

\(=\frac{-10-45+55}{77}\)

\(=\frac{0}{77}\)

\(=0\)

1. composer

2. performance

3. performance

4. boneless

5. carefully

6. educated

7. paintings

8. popularity

Hơi xấu nên thông cảm ạ

10x+23⋮2x+1

=>10x+5+18⋮2x+1

=>18⋮2x+1

mà 2x+1>=1 và 2x+1 lẻ(Do x là số tự nhiên)

nên 2x+1∈{1;3;9}

=>2x∈{0;2;8}

=>x∈{0;1;4}

They don’t drink soda every day.

->Đây là thì hiện tại đơn

They don’t drink soda every day.

A = \(\frac{1}{1\times2}\) + \(\frac{1}{2\times3}\) + \(\frac{1}{3\times4}\) + ... + \(\frac{1}{19\times20}\) + \(\frac{1}{20\times21}\)

A = \(\frac11\) - \(\frac12\) + \(\frac12\) - \(\frac13\) + \(\frac13\) - \(\frac14\) + ... + \(\frac{1}{19}\) - \(\frac{1}{20}\) + \(\frac{1}{20}\) - \(\frac{1}{21}\)

A = \(\frac11\) - \(\frac{1}{21}\)

A = \(\frac{20}{21}\)

Ta có: \(\frac{1}{1\times2}+\frac{1}{2\times3}+\cdots+\frac{1}{20\times21}\)

\(=1-\frac12+\frac12-\frac13+\cdots+\frac{1}{20}-\frac{1}{21}\)

\(=1-\frac{1}{21}=\frac{20}{21}\)

1

unmanageable

2

indecisive

3

compulsory

4

encouragement

5

accompanied

6

unexpectedly

7

overconfident

8

geographical

9

breathtaking

10

effectiveness

1. The boy was very violent and unmanageable. (manage)
2. He can never make up his mind; he is very indecisive. (decide)
3. Military service is no longer compulsory in South Africa. (compel)
4. His parents gave him a lot of encouragement in his studies. (courage)
5. Children under 12 accompanied by an adult can enter for free. (company)
6. We always have a spare room in case visitors arrive unexpectedly. (expect)
7. Even if you’re good at a game, you shouldn’t be overconfident. (confident)
8. His geographical knowledge is very poor. He thinks Paris is in Italy. (geography)
9. After climbing all day we were rewarded with a breathtaking view at the top. (breath)
10. I don't doubt the effectiveness of this new gadget, but we simply don't have the money to buy it. (effect)

chúc bạn học tốt!