5,6 × 2 + 2,8 × 8 + 11,2 × 2 - 48,5

= 11,2 + 2,8 × 4 × 2 + 11,2 × 2 - 9,7 × 5

= 11,2 +    11,2 × 2   + 11,2 × 2 - 9,7 × 5

=   11,2 × ( 1 + 2 + 2 )  - 9,7 × 5

=   11,2 × 5 - 9,7 × 5

=    (11,2 - 9,7) × 5

=         1,5  ×  5

=           7,5

56

34,245 : 0,01 = 3424,5

Khi chia một số thập phân cho 0,1; 0,01;... ta dịch dấu phẩy của số đó sang trái một hàng, hai hàng, ba hàng...

Giải:

a; Chu vi của bánh xe là:

0,25 x 2 x 3,14 = 1,57(m)

b; 4,71km = 4710m

Bánh xe đã lăn số vòng là:

4710 : 1,57 = 3000(vòng)

Đáp số: 3000 vòng

1324363 m

10\(x\) = 592992

\(x\) = 592992 : 10

\(x\) = 59299,2

Vậy \(x\) = 59299,2

x=59299,2

Là kể lại chuyện của 1 nv?

(n\(^2\) + 5n + 7n) ⋮ (n + 2n)

n[n + (5 + 7)]⋮ (3n)

n[n + 12] ⋮ (3n)

⇔ [n + 12] ⋮ 3

n ⋮ 3

n = 3k (k ∈ N)

[\(x^2+x+6\)] ⋮ (\(x+1\))

[\(x\left(x+1\right)\) + 6] ⋮ (\(x\) + 1)

6 ⋮ (\(x\) + 1)

(\(x\) + 1) ∈ Ư(6) = {-6; -3; -2; -1; 1; 2; 3; 6}

\(x\) ∈ {-7; - 4; -3; -2; 0; 1; 2; 5}

Vậy \(x\) ∈ {-7; - 4; -3; -2; 0; 1; 2; 5}

help me plzzzzzzzzzzzzz

chịu ko làm đc

Là sao tôi vẫn không hiểu nghĩa của câu hỏi này lắm :/

Bạn chụp thiếu thì phải :?

ah bn ơi trên 2 câu trả lời mới mở đc nhé nó bj lỗi ấy

chịu

khoan đã bọn mày làm thiếu bài tập cách 2 nhé?

Ceremony: The ceremony was held in the school yard, and all students wore uniforms. Contestant: Each contestant tried their best, so the competition became very exciting. Longevity: People believe that exercise is important, because it helps improve longevity. Monk: The monk lives a simple life, but he is respected by many people.

Igloo: The Inuit built an igloo because the weather was extremely cold.

Interact: Students can interact with teachers online, so learning becomes more flexible. Musher: The musher controlled the dogs carefully, while the race was taking place.

Tap: Turn off the tap after use, so that we can save water.

Function: Each part of the machine has its own function, and they work together.

Hyperloop: Hyperloop is a modern transport system, but it is still being developed.

Ferry: We went to the island by ferry, because there was no bridge.

Bullying: Bullying should be stopped, because it seriously affects students’ mental health. Post: The sign was fixed to a post, so everyone could see it clearly.

Statue: The statue was built many years ago, and it represents a national hero.

Wooden: The house is wooden, but it is very strong and beautiful.