các số tự nhiên từ 1 đến 11 được viết theo 1 thứ tự tùy ý. sau đó đem cộng mỗi số với số chỉ thứ tự của nó ta được 1 tổng . chứng minh rằng trong các tổng nhận được bao giờ cũng tìm ra 2 tổng mà hiệu của chúng là 1 số chia hết cho 10 . mình viết cho bạn rồi đấy k điểm cho mình đi
Các anh chị cho em hỏi em sắp lên lớp 8 thì nên đăng ký lớp 7 hay lớp 8 trên olm.vn ạ. Em xin cám ơn
các bạn, senpai từng thi violympic toán cấp huyên, tỉnh hay thành phố cho mình xin câu hỏi hay hay hoặc khó nha
mình hứa sẽ cho 1 like
cảm ơn nhìu
Cho mình hỏi;
trứng có trước hay gà có trước
Câu ai trả lời hay thi mình tick cho
cho A là số phương có tận cùng là 21 hỏi chữ số hàng trăm của A là chẵn hay lẻ. "đây là câu hỏi của @hoángphuc. Mình xem lời giải của ngonhuminh nhưng chưa rõ một số cái lên muốn tìm hiểu thêm "
p/s: Ai không trả lời được xin đừng post vào câu này làm tối nhé. Cảm ơn!
1000+1000=?
các bạn ơi ai từ lớp 7 trở lên kb với mình nhé mình có một vài câu hỏi về toán lớp 7 cần hỏi
câu hỏi cho các bạn nè
slenderman có thật không
hãy chứng minh điều đó
ký tên: the ocean
không đăng nội dung ai đăng thì sẽ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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Có bạn nào biết làm bài này thì giúp mình nha mình đang cần gấp trước 6 giờ( rất gấp rồi chỉ còn 2 tiếng) mình cảm ơn nhiều (KO dùng hình bình hành, đường cao, tam giác cân, đường trung tuyến hay các kiến thức lớp 8) chỉ làm câu c,d ( có hình)
cho mình hỏi mấy bạn lớp 7 ạ trình bày bài đại lượng tỉ lệ nghịch như này là đúng hay sai ạ?
câu hỏi này không mang tính chất spam!!
cho mình hỏi ai học trường trung học cơ sở phổ nhơn lớp 7 vậy ( nếu ai học trường ấy thì mình kết bạn và tích cho 3 cái ,lưu ý: mình có 1 câu hỏi để hỏi trước khi tích và kết bạn)