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Cac dang toan on thi vao lop 10 Toan tap

# Cac dang toan on thi vao lop 10 Toan tap - H thng cc bi tp...

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HÖ thèng c¸c bμi tËp «n tËp To¸n 9 (Dïng cho häc sinh líp 9 «n tËp häc kú 2 vμ thi vμo THPT) N¨m häc 2008 - 2009 Biªn so¹n néi dung: ThÇy NguyÔn Cao Cêng - 0904.15.16.50 Email: [email protected] [email protected]

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x 2 x 2 x 1 1 P 1: x x 1 x x 1 x 1 + - - = - + + - + + 1 1 3 1 2 : 1 1 1 1 1 x x P x x x x x - + = + + - - + - - + + - + + - - + + = 1 1 : 1 1 1 2 2 x x x x x x x x P P 1 + + + + + + + = 1 1 : 1 1 1 2 x x x x x x x x P 7 2 9 53 - = x P 1 P = 2 x - 1 1 - = x P Tμi liÖu «n thi vμo 10 Tμi liÖu «n thi vμo 10 Ph©n 1. To¸n rót gän Bμi 1 : Cho biÓu thøc: P = x+2 x-7 x-1 1 1 + : - x-9 3- x x+3 x-1 a/ Rót gän P b/ TÝnh gi¸ trÞ cña P biÕt 19 8 3 x = - c/ T×m c¸c gi¸ trÞ x nguyªn ®Ó P nhËn gi¸ trÞ nguyªn d/ T×m x ®Ó P < 1 Bμi 2 : Cho biÓu thøc: a/ Rót gän P b/ TÝnh gi¸ trÞ cña P biÕt 7 4 3 x = - c/ T×m gi¸ trÞ nhá nhÊt cña P d/ T×m x ®Ó Bμi 3 : Cho biÓu thøc a/ Rót gän P b/ T×m x ®Ó Bμi 4 : Cho biÓu thøc a/ Rót gän P b/ T×m c¸c gi¸ trÞ x nguyªn ®Ó P nhËn gi¸ trÞ nguyªn c/ T×m gi¸ trÞ nhá nhÊt cña biÓu thøc d/ T×m x ®Ó P > 1 Bμi 5 : Cho biÓu thøc a/ Rót gän P. b/ TÝnh gi¸ trÞ cña P biÕt c/ T×m gi¸ trÞ nhá nhÊt cña biÓu thøc Bμi 6 : Cho biÓu thøc - + - + - - + + + + - = 6 2 2 3 3 2 : 1 1 x x x x x x x x x P Biªn so¹n néi dung: ThÇy NguyÔn Cao Cêng 0904.15.16.50 2
Tμi liÖu «n thi vμo 10 a) Rót gän P b) TÝnh gi¸ trÞ cña P biÕt 2 5 3 - = x c) T×m c¸c gi¸ trÞ x nguyªn ®Ó P nhËn gi¸ trÞ nguyªn d) T×m x ®Ó P < 1 e) T×m c¸c gi¸ trÞ cña x ®Ó 3 - = x P Bμi 7 : Cho biÓu thøc 3 3 2 1 2 3 3 2 11 15 + + - - - + - + - = x x x x x x x P a) Rót gän P b) T×m c¸c gi¸ trÞ cña x sao cho 2 1 = P c) Chøng minh P 3 2 Bμi 8 : Cho biÓu thøc 1- x x x 2 2 1- x P - : x - 2 1- x x -3 x 2 x - 2 x - 2 x �� + = + + �� �� + �� a) Rót gän P b) TÝnh gi¸ trÞ cña P biÕt 5 2 6 - = x c) T×m gi¸ trÞ lín nhÊt cña x P Bμi 9 : Cho biÓu thøc 1 4 4 1 : 2 1 1 1 4 5 2 2 1 + + - - - - - + - = x x x x x x x P a) Rót gän P b) TÝnh gi¸ trÞ cña P nÕu x 1 = c) T×m c¸c gi¸ trÞ cña x ®Ó 2 1 - = P d) T×m c¸c gi¸ tri x nguyªn ®Ó P nhËn gi¸ trÞ nguyªn Bμi 10 : Cho biÓu thøc - - + - + - = x x x x x x P 1 2 1 1 : 1 1 a) Rót gän P b) TÝnh gi¸ trÞ cña biÕt 3 4 7 - = x c) T×m c¸c gi¸ trÞ cña m ®Ó cã c¸c gi¸ trÞ x tho¶ m·n x m x P - = . Bμi 11 : Cho biÓu thøc 2 x 1 2 x 6 x 5 P 1 : 2 1 9x 3 x 1 3 x 1 � � - + = - - - � � � � - + + � � a) Rót gän P b) T×m c¸c gi¸ trÞ cña x ®Ó x P = c) Cho 1 3 5 2 ) 1 ( 2 - + - - = x m x m P (x lμ Èn). T×m m ®Ó ph¬ng tr×nh cã hai nghiÖm cïng dÊu. X¸c ®Þnh dÊu cña hai nghiÖm ®ã.

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Cac dang toan on thi vao lop 10 Toan tap - H thng cc bi tp...

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