41. They put on a new roof last year.

- A new roof was put on last year

42. Someone empties the dustbins every Thursday.

- The dustbins are epmtied every Thursday.

43. She delivers milk at about six o’clock .

- Milk is delivered  at about six o’clock .

44. They are going to finish a new school in the village next year.

- A new school is beeing to finished school in the village next year.

45. The police are questioning the man.

- The man is beeing  questioned by the police. 

46. They will probably send him back to Britain.

- he will be probably sent back to Britain.

47. Since then people have seen him  in 10 different countries

- He has been seen in 10 different countries since then.

41. They put on a new roof last year.

- A new roof was put on last year

42. Someone empties the dustbins every Thursday.

- The dustbins are emptied every Thursday.

43. She delivers milk at about six o’clock .

- Milk is delivered  at about six o’clock .

44. They are going to finish a new school in the village next year.

- A new school is beeing to finished school in the village next year.

45. The police are questioning the man.

- The man is beeing  questioned by the police. 

46. They will probably send him back to Britain.

- He will be probably sent back to Britain.

47. Since then people have seen him  in 10 different countries

- He has been seen in 10 different countries since then.

\(e,\left(x-2\right)^2-16=0\\ \Leftrightarrow\left(x-6\right)\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=6\\x=-2\end{matrix}\right.\\ f,x^2-5x-14=0\\ \Leftrightarrow\left(x-7\right)\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ g,8x\left(x-3\right)+x-3=0\\ \Leftrightarrow\left(8x+1\right)\left(x-3\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{8}\\x=3\end{matrix}\right.\)

e)\(\left(x-2-4\right)\left(x-2+4\right)=\left(x-6\right)\left(x+2\right)\)

f)\(x^2-5x-14=x^2-2.\dfrac{5}{2}x+\dfrac{25}{2}+\dfrac{3}{2}=\left(x-\dfrac{5}{2}\right)^2+\dfrac{3}{2}\)

e: Ta có: \(\left(x-2\right)^2-16=0\)

\(\Leftrightarrow\left(x-6\right)\left(x+2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=6\\x=-2\end{matrix}\right.\)

f: Ta có: \(x^2-5x-14=0\)

\(\Leftrightarrow\left(x-7\right)\left(x+2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\)

`@` `\text {Ans}`

`\downarrow`

`a)`

`-(-18 + 45) - (18 + 55)`

`= 18 - 45 - 18 - 55`

`= (18 - 18) - (45 + 55)`

`= -100`

`b)`

`24. (5 - 178) + 178 . (10 + 24)`

`= 24.5 - 24.178 + 178. 10 + 178. 24`

`= 24.5 + 178.(-24 + 10 + 24)`

`= 24.5 + 178.10`

`=120 + 1780`

`=``1900`

`c)`

`29.(-101)`

`= -2929`

`d)`

\((- 56 + 130) – (43 – 56) – (- 20 – 43)\)

`= -56 + 130 - 43 + 56 + 20 + 43`

`= (56 - 56) + (130 + 20) + (-43+43)`

`= 150`

Tại sao người mua chữ năm cũ bây giờ lại không thấy?

Đây ạ :

Bài thơ thể hiện sâu sắc tình cảnh đáng thương của ông đồ đúng không?

- Nhưng mỗi năm mỗi vắng

Người thuê viết nay đâu?

41 + 42 + 43 + 44 - 21 - 22 - 23 - 24

= (41 - 21) + (42 - 22) + (43 - 23) + (44 - 24)

= 20 + 20 + 20 + 20

= 20 x 4

= 80

tk nha. chúc bn học giỏi :)

= 80 nha

TK MK NHA CÁC BẠN MK ĐG BỊ ÂM ĐIỂM

Giúp em thì ai giúp anh, chị đây! Hỏi mãi chưa có chế nào trả lời đây. Huhuhu$$$

Đú đởn ăn chơi học hành sa sút đến nỗi có bài toán đơn giản như zậy mà cũng phải hỏi !

40-41+42-43+44-45+46-47+48-49+50-51+52-53+54-55+56-57+58=

=40+(42-41)+(44-43)+(46-45)+(48-47)+(50-49)+(52-51)+(54-53)+(56-55)+(58-57)=49

chơi ff ko xin id

tìm số tự nhiên a lớn nhất sao cho:13 ;15 ;61 chia hết cho a đều dư 1

Tham khảo

Câu hỏi của Sakura kun - Toán lớp 6 - Học toán với OnlineMath

7/12 =4/12+3/12 =1/3 + 1/4 =20/60 +20/80

1/41+1/42+1/43+...+1/80 = (1/41+1/42+...+1/60)+(1/61+1/62+...+1/80)

Vì 1/41>1/42>1/43>...>1/59>1/60 => 1/41+1/42+...+1/60>1/60+1/60+...+1/60=20/60

và 1/61>1/62>...>1/80  =>1/61+1/62+...+1/80>1/80+1/80+...+1/80=20/80

=> 1/41+1/42+...+1/80>20/60+20/80=7/12

=>1/41+1/42+...+1/80>7/12

bạn ơi xem lại đề

a:

N=15

c: Cân nặng trung bình là:

\(\dfrac{39\cdot1+40\cdot4+41\cdot3+42\cdot4+43+45\cdot2}{15}\simeq41,5\left(kg\right)\)

c,65

like nha b

A

A. 41; 43; 45; 47; 49.