Ta có : $a+3 ≤x≤a+2018$
$⇒x ∈ ${$a+3,a+4,...,a+2017,a+2018$}
Tổng các số nguyên $x$ là :
$a+3+a+4+...+a+2017+a+2018$
$=(a+a+...+a+a)+(3+4+...+2017+2018)$
$=2016a + \dfrac{2016.2021}{2} $
$=2016a+2037168$
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Đốt cháy 19 kg than có chứa 96% C và tạp chất không cháy trong phòng kín có chứa 2,24 m3 không khí ở đktc. Than có cháy hết không? Vì sao? Biết oxi chiếm 1/5 thể tích không khí.
một vật rơi tự do từ độ cao h xuống đất gọi t1 là tg khi vật rơi đc quãng đường nửa độ cao t là tg rơi của vật khi chạm đất tỉ số giữa t1 và t bằng bao nhiêu
Giúp mik vs Choose the sentence which has the closest meaning to the original one. 31.He could escape from hurt because he was wearing protective clothes. a. Thanks to his protective clothes, he could escape from hurt. b. His protective clothes made him hurt. c. Due to his protective clothes, he was hurt. d. His being hurt made his unable to wear protective clothes. 32.We were unable to type the contract because the computer malfunctioned. a. Despite a computer malfunction, we managed to finish typing the contract. b. The computer malfunction helped us complete the contract. c. The fact that the computer malfunction prevented us from typing the contract. d. Thanks to the computer malfunction, we could type the contract. 33.The roads were slippery because it snowed heavily. a. It snowed too heavily to make the roads slippery. b. The heavy snow prevented the roads from-being slippery. c. Thanks to the slip of the roads, it snowed heavily. d. The heavy snow made the roads slippery. 34.The accident happened because she was careless. a. The accident was prevented due to her carelessness. b. Her carelessness was responsible for the accident. c. It was the accident that made her careless. d. The more careless she was, the less accident happened. 35.I did not understand what the lecturer was saying because I had not read his book. a. What the lecturer wrote and said was too difficult for me to understand. b. The lecturer's book which I had not read was difficult to understand. c. I found it very difficult to understand what the lecturer said in his book. d. I would have understood what the lecturer was saying if I had read his book.
số đôi chân ngực của lớp hình nhện mấy đôi
Tìm các phân số thỏa mãn mỗi điều kiện sau Có mẫu là 30 lớn hơn 5/17 và nhỏ hơn 6/17
hoan canh nao khien Ly Cong Uan tu Hoa Lu sang thanh Dai La
Tìm giá trị nhỏ nhất của biểu thức: a,A=|x-3|+11 b,B=|x+11|+|y-2|-2020
Bài 1 : Điền số thích hợp vào chỗ chấm : 0,05 m ³ = ...................cm ³ 4789 cm ³ = .....................dm ³ 1 m ³ 246 dm ³ = ........................dm ³ 4 m ³ 58 dm ³ = ........................dm ³ 5 m ³ 5 dm ³ = ...................dm ³ 1997 dm ³ = ...............................m ³ .......................dm ³ 10001 cm ³ = ........................m ³ .......................dm ³ 1234000 cm ³ = .............................m ³ .....................m ³ 40004000 cm ³ = ........................m ³ ..................m ³ MỌI NGƯỜI CHỈ CẦN VIẾT ĐÁP SỐ VÀ TÊN ĐƠN VỊ THÔI Ạ. CẢM ƠN MỌI NGƯỜI NHIỀU Ạ Δ Δ Δ Δ Δ Δ Δ
Tìm chữ số tận cùng của các số sau: a.57^1999 b.93^1999
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