Đề cương ôn tập tuyển sinh 10 môn Toán lớp 9

ĐỀ CƯƠNG ÔN TẬP TS 10 MÔN TOÁN LỚP 9 NĂM HỌC 2012- 2013 A. BIẾN ĐỔI ĐẠI SỐ VÀ TÍNH TOÁN: Tìm điều kiện căn thức có nghĩa và tính giá trị: Bài 1: cho biểu thức A = tìm điều kiện của x để A có nghĩa. Tìm giá trị của x để A= 5 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ Bài 2: cho biểu thức B = tìm điều kiện của x để B có nghĩa. Tìm giá trị của x để B= 2 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ Rút gọn và tính giá trị của biểu thức: Bài 1: cho biểu thức A = rút gọn biểu thức A tính giá trị của A khi x = 9 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Bài 2: cho biểu thức B = rút gọn biểu thức B tính giá trị của B khi x = 4 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................... rút gọn biểu thức: Bài 1: rút gọn các biểu thức sau: a) b) ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Bài 2:rút gọn các biểu thức sau: a) b) A= 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chứng minh đẳng thức: chứng minh = 4 b) 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giải phương trình: a) b) 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................................................................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ c) d) 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................................................................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ bài tập tổng hợp: 1) cho biểu thức P = a) rút gọn biểu thức P b) tính giá trị của P khi x = c) tìm các giá trị của x đề P > 2 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7. Bài tập tự luyện; Bài 1. tính : a) b) ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ Bài 2: với giá trị nào của x thì các biểu thức sau có nghĩa: a) b) B= c) C = ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ Bài 3:tính a) b) ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ c) d) ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ Bài 4:TÍNH a) A = b) B= ........................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................ .....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................