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    Chào mừng quý vị đến với Thư viện Bài giảng điện tử.

    Quý vị chưa đăng nhập hoặc chưa đăng ký làm thành viên, vì vậy chưa thể tải được các tư liệu của Thư viện về máy tính của mình.
    Nếu đã đăng ký rồi, quý vị có thể đăng nhập ở ngay ô bên phải.

    violympic- lop5- vong 2

    Nhấn vào đây để tải về
    Báo tài liệu có sai sót
    Nhắn tin cho tác giả
    (Tài liệu chưa được thẩm định)
    Nguồn:
    Người gửi: Co Loi
    Ngày gửi: 23h:08' 05-01-2011
    Dung lượng: 230.0 KB
    Số lượt tải: 58
    Số lượt thích: 1 người (Bùi Thị Diệp)
    Violympic
    Vòng 2
    pHạM THị LợI -Hà GIANG
    3.1: Tìm 1 p/s có mẫu số hơn tử số là 36 và có giá trị = 3/5
    54/90
    Bài 3: Vòng 2
    3.2: Tìm 1 p/s có mẫu số hơn tử số là 52 và có tổng ts và ms là 86 đơn vị.
    17/69
    3.3: Tìm 1 p/s có mẫu số hơn tử số là 15 và biết phân số đó = 51/68
    45/60
    3.4 Tìm hai số lẻ biết tổng của chúng = 999 và giữa chúng cóp 25 số lẻ nữa.
    Giải
    Giữa hai số lẻ có 1số chẵn nên hiệu của chúng là:
    25 x 2 + 1 = 51
    Số bé là (999 - 51) : 2 = 474
    Số lớn là: 999 - 474 = 525
    Đ/s SB: 474 SL: 525
    3.5 Tìm hai số chẵn biết tổng của chúng = 286 và giữa chúng có 18 số chẵn khác.
    Hiệu 2 số là: 18 x2 + 2=38
    SB: (286 - 38) :2 = 124 SL: 285 - 124 =162
    3.6 Hiện nay, tổng số tuổi của hai cha con là 56 tuổi, biết cha hơn con 28 tuổi. Tính tuổi mỗi người?
    Cha: 42 Con: 14
    3.7:Hai kho thóc chứa 216 tấn thóc, biết nếu chuyển từ kho 1 sang kho hai 15 tấn thóc thì hai kho bằng nhau.Tính số thóc ở mỗi kho
    Kho 1: 123 tấn
    Kho 2: 93 tấn
    3.8:Tìm 1 p/s có mẫu số hơn tử số là 52 và có giá trị=51/ 85
    78/130
    3.9:Tìm hai số chẵn biết tổng của chúng = 848 và giữa chúng có 13 số chẵn khác.

    Hiệu 2 số là: 13 x 2 + 2 = 28
    SB: (848 - 28) :2 = 410 SL: 848 - 410 =438
     
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