Các bài Luyện tập
Chia sẻ bởi Phạm Minh Quang |
Ngày 01/05/2019 |
50
Chia sẻ tài liệu: Các bài Luyện tập thuộc Đại số 8
Nội dung tài liệu:
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Trang bìa
Trang bìa:
PHÒNG GIÁO DỤC CHÂU THÀNH TRƯỜNG THCS THÂN CỬU NGHĨA TIẾT 18 LUYỆN TẬP CHIA ĐA THỨC Người soạn : PHẠM MINH QUANG CHIA ĐA THỨC
HOẠT ĐỘNG 1:CHIA ĐA THỨC CHO ĐA THỨC: CHIA ĐA THỨC CHO ĐA THỨC
latex((-3x^2+ 2x^4 + x^3 + 5x - 2) Bài tập 72 (SGK): Làm tính chia : ( latex(-x + x^2 +1)) LATEX(2x^4 + x^3 - 3x^2 + 5x - 2 latex(x^2 - x +1) latex(2x^2) latex(-2x^4+ 2x^3-2x^2) + 0 + latex(3x^3- 5x^2+ 5x - 2 + 3x - 3latex(x^3+ 3x^2- 3x) + 0 - 2latex(x^2)+ 2x - 2 -2 2latex(x^2)- 2x + 2 + 0 HOẠT ĐỘNG 2: PHIẾU HỌC TẬP: PHIẾU HỌC TẬP
BÀI TẬP 70: Làm tính chia a) (latex(25x^5- 5x^4+ 10x^2)) : ( 5latex(x^2)) b)(latex(15x^3y^2- 6x^2y - 3x^2y^2)): 6latex(x^2y) = 5latex(x^3- x^2 + 2) = latex(5/2xy - 1 - 1/2y) HOẠT ĐỘNG 3:Trắc nghiệm chọn đáp án đúng: CCHỌN CÂU ĐỦNGTONG CÁC CÂU TRẢ LỜI SAU
Chọn câu trả lời đúng trong các câu trả lời sau( latex(27x^3 -1)):(3x -1) bằng:
A) 9latex(x^2 - 1)
B) 9latex(x^2 + 3x + 1)
C) 9latex(x^2 + 9x +1)
D) Một đáp án khác
HOẠT ĐỘNG 4: TRẮC NGHIỆM: TRẮC NGHIỆM :Đúng, sai
Các câu sau đây đúng hay sai
A= 15latex(x^4) - 8latex(x^3) + latex(x^2)chia hết cho B= latex(1/2x^2)
A = latex( x^2 - 2x +1) chia hết cho B = 1 - x
latex(5x^3-7x^2+x)chia hết cho latex(3x^n) chỉ khi n=1 với n là số tự nhiên
latex(x^4y^3-5x^3y^3+6x^2y^2)chia hết cho latex(5x^ny^n) khi latex(n<=2) với n là số tự nhiên
HOẠT ĐỘNG 5 : Củng cố: CHIA ĐA THỨC CÓ NHIỀU BIẾN
Chia đa thức có nhiều biến (4latex(x^2 - 9y^2)) : ( 2x - 3y) 1) Dùng hằng đẳng thức để thực hện phép chia =[(2x + 3y)(2x - 3y)] : (2x -3y) = 2x + 3y (latex(x^2 - 3x + xy - 3y)) : (x + y) 2) Dùng phương pháp phân tích đa thức thành nhân tử để chia = [ x(x - 3) + y(x - 3)] :(x + y) = [(x - 3) (x + y)] : (x+y) = x - 3 Tìm n để A chia hết cho B: Tìm số eự nhiên n để A chia hết cho B
Tìm số tự nhiên n để A = latex(-5x^ny^7) chia hết cho B=latex(3x^3y^n) A : B = (latex(-5x^ny^7)):(latex(3x^3y^n)) = latex(-5/3)latex(x^(n-3)y^(7-n)) A chia hết cho B khi latex(n>=3) và latex(n<=7) Vậy: latex(3<=n<=7) hay n= 3;4;5;6;7 Tìm a để A(x) chia hết cho B(x): Tìm a để A(x) chia hết cho B(x)
Tìm số a để đa thức A(x) = latex(2x^3 -3x^2 + x +a +10) chia hết cho đa thức B(x) = x+2 latex(2x^3 - 3x^2 +x +a+ 10) x + 2 latex(2x^2) latex(-2x^3-4x^2) + 0 latex(-7x^2+ x + a +10) - 7x latex(7x^2+14x) + 0 + 15x + a+10 +15 -15x - 30 + 0 + a - 20 A(x) chia hết cho B(x) khi a - 20 = 0 hay a = 20 DẶN DÒ:
Tiết sau ôn tập. Các em về nhà xem và trả lời 5 câu hỏi ôn tập trong phần ôn tập chương. Làm bài tập 77, 78, 79, 80,81 SGK,chuẩn bị kiểm tra một tiết.
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PHÒNG GIÁO DỤC CHÂU THÀNH TRƯỜNG THCS THÂN CỬU NGHĨA TIẾT 18 LUYỆN TẬP CHIA ĐA THỨC Người soạn : PHẠM MINH QUANG CHIA ĐA THỨC
HOẠT ĐỘNG 1:CHIA ĐA THỨC CHO ĐA THỨC: CHIA ĐA THỨC CHO ĐA THỨC
latex((-3x^2+ 2x^4 + x^3 + 5x - 2) Bài tập 72 (SGK): Làm tính chia : ( latex(-x + x^2 +1)) LATEX(2x^4 + x^3 - 3x^2 + 5x - 2 latex(x^2 - x +1) latex(2x^2) latex(-2x^4+ 2x^3-2x^2) + 0 + latex(3x^3- 5x^2+ 5x - 2 + 3x - 3latex(x^3+ 3x^2- 3x) + 0 - 2latex(x^2)+ 2x - 2 -2 2latex(x^2)- 2x + 2 + 0 HOẠT ĐỘNG 2: PHIẾU HỌC TẬP: PHIẾU HỌC TẬP
BÀI TẬP 70: Làm tính chia a) (latex(25x^5- 5x^4+ 10x^2)) : ( 5latex(x^2)) b)(latex(15x^3y^2- 6x^2y - 3x^2y^2)): 6latex(x^2y) = 5latex(x^3- x^2 + 2) = latex(5/2xy - 1 - 1/2y) HOẠT ĐỘNG 3:Trắc nghiệm chọn đáp án đúng: CCHỌN CÂU ĐỦNGTONG CÁC CÂU TRẢ LỜI SAU
Chọn câu trả lời đúng trong các câu trả lời sau( latex(27x^3 -1)):(3x -1) bằng:
A) 9latex(x^2 - 1)
B) 9latex(x^2 + 3x + 1)
C) 9latex(x^2 + 9x +1)
D) Một đáp án khác
HOẠT ĐỘNG 4: TRẮC NGHIỆM: TRẮC NGHIỆM :Đúng, sai
Các câu sau đây đúng hay sai
A= 15latex(x^4) - 8latex(x^3) + latex(x^2)chia hết cho B= latex(1/2x^2)
A = latex( x^2 - 2x +1) chia hết cho B = 1 - x
latex(5x^3-7x^2+x)chia hết cho latex(3x^n) chỉ khi n=1 với n là số tự nhiên
latex(x^4y^3-5x^3y^3+6x^2y^2)chia hết cho latex(5x^ny^n) khi latex(n<=2) với n là số tự nhiên
HOẠT ĐỘNG 5 : Củng cố: CHIA ĐA THỨC CÓ NHIỀU BIẾN
Chia đa thức có nhiều biến (4latex(x^2 - 9y^2)) : ( 2x - 3y) 1) Dùng hằng đẳng thức để thực hện phép chia =[(2x + 3y)(2x - 3y)] : (2x -3y) = 2x + 3y (latex(x^2 - 3x + xy - 3y)) : (x + y) 2) Dùng phương pháp phân tích đa thức thành nhân tử để chia = [ x(x - 3) + y(x - 3)] :(x + y) = [(x - 3) (x + y)] : (x+y) = x - 3 Tìm n để A chia hết cho B: Tìm số eự nhiên n để A chia hết cho B
Tìm số tự nhiên n để A = latex(-5x^ny^7) chia hết cho B=latex(3x^3y^n) A : B = (latex(-5x^ny^7)):(latex(3x^3y^n)) = latex(-5/3)latex(x^(n-3)y^(7-n)) A chia hết cho B khi latex(n>=3) và latex(n<=7) Vậy: latex(3<=n<=7) hay n= 3;4;5;6;7 Tìm a để A(x) chia hết cho B(x): Tìm a để A(x) chia hết cho B(x)
Tìm số a để đa thức A(x) = latex(2x^3 -3x^2 + x +a +10) chia hết cho đa thức B(x) = x+2 latex(2x^3 - 3x^2 +x +a+ 10) x + 2 latex(2x^2) latex(-2x^3-4x^2) + 0 latex(-7x^2+ x + a +10) - 7x latex(7x^2+14x) + 0 + 15x + a+10 +15 -15x - 30 + 0 + a - 20 A(x) chia hết cho B(x) khi a - 20 = 0 hay a = 20 DẶN DÒ:
Tiết sau ôn tập. Các em về nhà xem và trả lời 5 câu hỏi ôn tập trong phần ôn tập chương. Làm bài tập 77, 78, 79, 80,81 SGK,chuẩn bị kiểm tra một tiết.
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Người chia sẻ: Phạm Minh Quang
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Lượt tài: 2
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Nguồn : Chưa rõ
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