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Người thầy trung bình chỉ biết nói. Người thầy giỏi biết giải thích. Người thầy xuất chúng biết minh họa. Người thầy vĩ đại biết cách truyền cảm hứng – William A. Warrd
Bây giờ là:

Chào mừng quý vị đến với website của Lê Tiến Ngân

Quý vị chưa đăng nhập hoặc chưa đăng ký làm thành viên, vì vậy chưa thể tải được các tài liệu của Thư viện về máy tính của mình.
Nếu chưa đăng ký, hãy nhấn vào chữ ĐK thành viên ở phía bên trái, hoặc xem phim hướng dẫn tại đây
Nếu đã đăng ký rồi, quý vị có thể đăng nhập ở ngay phía bên trái.

hsg 5

Nhấn vào đây để tải về
Hiển thị toàn màn hình
Báo tài liệu có sai sót
Nhắn tin cho tác giả
(Tài liệu chưa được thẩm định)
Nguồn:
Người gửi: Lê Tiến Ngân (trang riêng)
Ngày gửi: 19h:17' 18-11-2013
Dung lượng: 1.7 MB
Số lượt tải: 3
Số lượt thích: 0 người
TỔNG HỢP ÔN THI HỌC SINH GIỎI 5
BÀI 1. CÁC DẠNG TOÁN THƯỜNG GẶP .
I. MỤC TIÊU TIẾT DẠY :
HS nắm được dạng toán và các bước giải dạng toán này.
- Làm được một số bài tập nâng cao.
- Rèn kỹ năng tính toán cho học sinh .
II. CHUẨN BỊ
Câu hỏi và bài tập thuộc dạng vừa học.
Các kiến thức có liên quan.
III. CÁC HOẠT ĐỘNG DẠY HỌC
1/ Ổn định tổ chức lớp.
2/ Kiểm tra bài cũ.
Gọi học sinh làm bài tập về nhà giờ trước, GV sửa chữa.
3/ Giảng bài mới.
Dạng 1 : Số chẵn, số lẻ, bài toán xét chữ số tận cùng của một số
* Kiến thức cần nhớ :
- Chữ số tận cùng của 1 tổng bằng chữ số tận cùng của tổng các chữ số hàng đơn vị của các số hạng trong tổng ấy.
- Chữ số tận cùng của 1 tích bằng chữ số tận cùng của tích các chữ số hàng đơn vị của các thừa số trong tích ấy.
- Tổng 1 + 2 + 3 + 4 + ...... + 9 có chữ số tận cùng bằng 5.
- Tích 1 x 3 x 5 x 7 x 9 có chữ số tận cùng bằng 5.
Tích a ì a không thể có tận cùng bằng 2, 3, 7 hoặc 8.
* Bài tập vận dụng :
Bài 1:
a) Nếu tổng của 2 số tự nhiên là 1 số lẻ, thì tích của chúng có thể là 1 số lẻ được không?
b) Nếu tích của 2 số tự nhiên là 1 số lẻ, thì tổng của chúng có thể là 1 số lẻ được không?
c) “Tổng” và “hiệu” hai số tự nhiên có thể là số chẵn, và số kia là lẻ được không?
Giải :
a) Tổng hai số tự nhiên là một số lẻ, như vậy tổng đó gồm 1 số chẵn và 1 số lẻ, do đó tích của chúng phải là 1 số chẵn (Không thể là một số lẻ được).
b) Tích hai số tự nhiên là 1 số lẻ, như vậy tích đó gồm 2 thừa số đều là số lẻ, do đó tổng của chúng phải là 1 số chẵn(Không thể là một số lẻ được).
c) Lấy “Tổng” cộng với “hiệu” ta được 2 lần số lớn, tức là được 1 số chẵn. Vậy “tổng” và “hiệu” phải là 2 số cùng chẵn hoặc cùng lẻ (Không thể 1 số là chẵn, số kia là lẻ được).
Bài toán 2 : Không cần làm tính, kiểm tra kết quả của phép tính sau đây đúng hay sai?
a, 1783 + 9789 + 375 + 8001 + 2797 = 22744
b, 1872 + 786 + 3748 + 3718 = 10115.
c, 5674 x 163 = 610783
Giải :
a, Kết quả trên là sai vì tổng của 5 số lẻ là 1 số lẻ.
b, Kết quả trên là sai vì tổng của các số chẵn là 1 số chẵn.
c, Kết quả trên là sai vì tích của 1số chẵn với bất kỳ 1 số nào cũng là một số chẵn.
Bài 3 : Tìm 4 số tự nhiên liên tiếp có tích bằng 24 024
Giải :
Ta thấy trong 4 số tự nhiên liên tiếp thì không có thừa số nào có chữ số tận cùng là 0; 5 vì như thế tích sẽ tận cùng là chữ số 0 (trái với bài toán)
Do đó 4 số phải tìm chỉ có thể có chữ số tận cùng liên tiếp là 1, 2, 3, 4 và 6, 7, 8, 9
Ta có :
24 024 > 10 000 = 10 x 10 x 10 x 10
24 024 < 160 000 = 20 x 20 x 20 x 20
Nên tích của 4 số đó là :
11 x 12 x 13 x 14 hoặc
16 x 17 x 18 x 19
Có : 11 x 12 x 13 x 14 = 24 024
16 x 17 x 18 x 19 = 93 024.
Vậy 4 số phải tìm là : 11, 12, 13, 14.
Bài 4 : Có thể tìm được 2 số tự nhiên sao cho hiệu của chúng nhân với 18 được 1989 không?
Giải :
Ta thấy số nào nhân với số chẵn tích cũng là 1 số chẵn. 18 là số chẵn mà 1989 là số lẻ.
Vì vậy không thể tìm được 2 số tự nhiên mà hiệu của chúng nhân với 18 được 1989.
Bài 5 : Có thể tìm được 1 số tự nhiên nào đó nhân với chính nó rồi trừ đi 2 hay 3 hay 7, 8 lại được 1 số tròn chục hay không.
Giải :
Số trừ đi 2,3 hay 7,8 là số tròn chục
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