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  • Dành cho Quảng cáo

    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.

    Chương II. §5. Phép cộng các phân thức đại số

    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: St (THCS Tân Châu-AG)
    Người gửi: Châu Công Minh
    Ngày gửi: 23h:57' 15-02-2009
    Dung lượng: 668.0 KB
    Số lượt tải: 290
    Số lượt thích: 0 người
    ĐẠI SỐ 8
    Bài 5: PHÉP CỘNG CÁC PHÂN THỨC ĐẠI SỐ
    Tiết: 28
    KIỂM TRA BÀI CŨ:
    Thực hiện phép tính?
    Di?n vào ch? tr?ng để được công thức đúng d
    Bài 5: PHÉP CỘNG CÁC PHÂN THỨC ĐẠI SỐ
    1/. Cộng hai phân thức cùng mẫu thức:
    Ví dụ1 : Cộng hai phân thức:
    Muốn cộng hai phân thức có cùng mẫu thức, ta cộng các tử thức với nhau và giữ nguyên mẫu thức.
    Giải
    Quy tắc :

    Thực hiện phép cộng :
    Các em chia nhóm mỗi nhóm thực hiện bài tóan (HD)
    ? 1
    Giải :
    2/. Cộng hai phân thức có mẫu thức khác nhau :
    ? 2 Thực hiện phép cộng :
    Giải :
    Quy tắc : Muốn cộng hai phân thức có mẫu thức khác nhau, ta quy đồng mẫu thức rồi cộng các phân thức có cùng mẫu thức vừa tìm được.
    Ví dụ 2 : Làm tính cộng:
    Giải :
    ? 3 Thực hiện phép cộng ( HD):
    Giải :
    Giải :
    Chú ý : Phép cộng các phân thức cũng có các tính chất sau:
    1/. Giao hóan :
    2/. Kết hợp :
    Bài tập: Thực hiện phép cộng:
    Bài 22 a: Ap dụng quy tắc đổi dấu để các phân thức có cùng
    mẫu thức rồi làm tính cộng phân thức:
    Giải :
    HƯỚNG DẪN VỀ NHÀ :
    - Về nhà học thuộc hai qui tắc và chú ý.
    - Biết vận dụng quy tắc để làm bài tập. Chú ý áp dụng quy tắc đổi dấu khi cần thiết để có mẫu thức chung hợp lý nhất
    - Chú ý rút gọn kết quả ( nếu có thể).
    - Bài tập về nhà 21; 23 a) trang 46 SGK.
    Đọc phần "Có thể em chưa biết" trang 46 SGK
    - Chuẩn bị trước bài tập 25; 26; 27 SGK trang 47, 48
    Chúc các em
    có một tiết học vui vẻ
    Bài học đã kết thúc rồi.
    Tạm biệt
    và hẹn gặp lại
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    Khócem kco kieu pai ?

    La hét

     

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    me lich cua con

    Mỉm cười

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    LU DIEN))

     
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