K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

9 tháng 7 2022

A = 2 + 22 + 23 +......+260

A = 2. (1 +2 +22+.....+259) vì 2 ⋮ 2 

⇔ A = 2 . ( 1 + 2+ 22+ .....+259) ⋮ 2 (đcm)

Give the correct form of verbs, use the present simple and present continuous 30.    He (wash)………… his car every Sunday. 31.    Where’s Cindy? – She (have)………….. a bath. 32. My father (live)…. in a house near the river because he (like)… swimming. 33.    Every morning, my mother (walk)………… in the park. 34.    What newspaper………you usually (read)……? – The Times. 35.    Be careful! The teacher (look)………… at...
Đọc tiếp

Give the correct form of verbs, use the present simple and present continuous

30.    He (wash)………… his car every Sunday.

31.    Where’s Cindy? – She (have)………….. a bath.

32. My father (live)…. in a house near the river because he (like)… swimming.

33.    Every morning, my mother (walk)………… in the park.

34.    What newspaper………you usually (read)……? – The Times.

35.    Be careful! The teacher (look)………… at you.

36.    …… your mother (do)…… morning exercise every day?

37. In summer, it (be) … very hot, so he often (go)… to the seaside on holiday.

38.    ……you (look)…. for Peter? I think he (read)…….books in the library.

39.    Mother (cook)……in the kitchen at the moment.

40.    Let’s (help)…………..her.

41.    She (not /want)…….any coffee. She (want)……some tea.

42.    They (not/go)………..fishing in winter.

43.    I (like)……………my English class very much.

44.    He usually (go)………….to the library when he has free time.

45.    What…………Mrs. Brown (do)………….? – She’s a teacher.

46.    What………….your father often (do)………….in the evening?

47.    Look! The boy (climb) ………….. up a ladder.

48. They (play)...volleyball every afternoon, but they (not/play)… badminton  now.

49.    He (learn)…… …. English and I (read)…… …. a book now.

50.    He often (have)… ………coffee for breakfast.

1
22 tháng 7 2022

30 . washes 

31 .....

32 . lives-likes

33.walks 

34 ...

35 . is looking

36 . Does-do

................(thui mk lười , mà chắc bạn cx ko cần nx đâu)

 

29 tháng 6 2022

Bạn ghi đúng môn học nhé.

Câu 1:

\(a,-13.\left|x-6\right|+53=27\)

\(\Rightarrow-13.\left|x-6\right|=-26\)

\(\Rightarrow\left|x-6\right|=2\)

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

\(\Rightarrow\left[{}\begin{matrix}x=8\\x=4\end{matrix}\right.\)

\(b,\left(3-x\right).\left(x-8\right)>0\)

Trường hợp 1: \(\left\{{}\begin{matrix}3-x>0\\x-8>0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x< 3\\x>8\end{matrix}\right.\Leftrightarrow x\in\varnothing\)

Trường hợp 2: \(\left\{{}\begin{matrix}3-x< 0\\x-8>0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x>3\\x< 8\end{matrix}\right.\Leftrightarrow3< x< 8\)

Mà đề ra \(x\inℤ\Rightarrow x\in\left\{4;5;6;7\right\}\)

Câu 2:

Nếu a > 0 thì \(10^a+168\) có chữ số tận cùng là \(0+8=8\). Mà không có số chính phương nào có chữ số tận cùng là 8.

\(\Rightarrow a=0\)

\(\Rightarrow10^0+168=169\)

\(\Rightarrow b^2=169\)

\(\Rightarrow b=\pm13\)

 

 

13 tháng 5 2022

Do trong quá trình truyền tải điện năng trong gia đình sẽ luôn xảy ra hiện tượng hao hụt ở một lượng nhất định