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

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    Các Bài giảng khác thuộc Chương trình Toán 5

    Tham khảo cùng nội dung: Bài giảng, Giáo án, E-learning, Bài mẫu, Sách giáo khoa, ...
    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: Nguyễn Thành Đạt
    Ngày gửi: 22h:35' 14-10-2008
    Dung lượng: 380.0 KB
    Số lượt tải: 202
    Số lượt thích: 0 người
    Môn toán lớp 5
    Kiểm tra bài cũ
    Tính giá trị biểu thức:
    29.8 x 0.2 + 13.4
    192.4 x 2 x 4.7
    = 5,96 + 13,4
    = 19,36
    = 384,8 x 4,7
    = 1808,56
    Bài 1 Chuyển thành phép nhân rồi tính:
    a) 6,75kg + 6,75kg + 6,75kg
    = 6,75kg x 3
    = 20,25kg
    b) 7,14m2 + 7,14m2 + 7,14m2 x3
    = 7,14m2 x (1 + 1 + 3)
    = 7,14m2 x5
    = 35,7m2
    c) 9,26dm3 x 9 + 9,26dm3
    = 9,26dm3 x (9 + 1)
    = 9,26dm3 x 10
    = 92,6dm3
    Bài 2 Tính:
    a) 3,125 + 2,075 x 2
    b) (3,125 + 2,075) x 2
    = 3,125 + 4,15
    = 7,275
    = 5,2 x 2
    = 10,4
    Bài3: Cuối năm 2000 số dân của nước ta là 77515000 người. Nếu tỉ lệ tăng dân số hằng năm là 1,3% thì đến năm 2001 số dân của nước ta là bao nhiêu người ?
    Bài giải
    Số dân nước ta tăng thêm trong năm 2001 là:
    77515000 : 100 x 1,3 = 1007695 (người)
    Số dân nước ta tính đến cuối năm 2001 là:
    1007695 + 77515000 = 78522695 (người)
    Đáp số: 78522695 người
    Bài 4: Một thuyền máy đi xuôi dòng từ bến A đến bến B. Vận tốc của thuyền máy khi nước lặng là 22,6km/giờ và vận tốc dòng nước là 2,2km/giờ. Sau 1 giờ 15 phút thì thuyền máy đến bến B. Tính độ dài quãng sông AB
    Bài giải
    Vận tốc của thuyền máy khi xuôi dòng là:
    22,6 + 2,2 = 24,8 (km/giờ)
    Thuyền máy đi từ bến A đến bến B hết 1giờ 15phút hay 1,25giờ
    Độ dài quãng sông AB là:
    24,8 x 1,25 = 31 (km)
    Đáp số: 31km
    Muốn tính quãng đường ta lấy vận tốc nhân với thời gian
    S = v x t
     
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