Bài kiểm tra số chương IV môn: Đại số 9

Tr­êng THCS qu¶ng phóc Bµi kiÓm tra sè ch­¬ng IV
 Tæ KHTN M«n: ®¹i sè 9 
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Hä vµ tªn:
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§iÓm
Lêi phª:
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Líp: 9
M· §Ò:01 
BAØI 1 (4 ñieåm ) Giaûi caùc phöông trình sau:
a) x2 - 3x + 14 = 0
b) x2 + 14x +45 = 0 	 
c) 2002x2 + 4x - 2006 = 0
BAØI 2. (3ñieåm) Cho hai haøm soá y= 2x2 vaø y = x + 2
Veõ ñoà thò hai haøm soá naøy treân cuøng moät maët phaúng toïa ñoä
Tìm toïa ñoä giao ñieåm hai ñoà thò ñoù (baèng ñoà thò ) 
BAØI 3. ( 3 ñieåm ) Cho phöông trình x2 + 4x + m – 1 = 0 
 a) T×m m ®Ó ph­¬ng tr×nh cã hai nghiÖm ph©n biÖt.
 b) Cho biÕt x1 = 2. TÝnh nghiÖm con l¹i x2 
 c) Tìm giaù trò cuûa m ñeå phöông trình coù hai nghieäm x1, x2 vaø x21 + x22 = 0
Bài làm 
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Tr­êng THCS qu¶ng phóc Bµi kiÓm tra sè ch­¬ng IV
 Tæ KHTN M«n: ®¹i sè 9 
*******************************************************************************************************
Hä vµ tªn:
.
§iÓm
Lêi phª:
.
.
Líp: 9
M· §Ò: 02 
BAØI 1. (4 ñieåm ) Giaûi caùc phöông trình sau:
a) x2 - 6x + 14 = 0
b) x2 + 14x – 45 = 0 	 
c) 2009x2 + 2x - 2011 = 0
BAØI 2. (3ñieåm) Cho hai haøm soá y= x2 vaø y = x + 2
Veõ ñoà thò hai haøm soá naøy treân cuøng moät maët phaúng toïa ñoä
Tìm toïa ñoä giao ñieåm hai ñoà thò ñoù (baèng ñoà thò ) 
BAØI 3. ( 3 ñieåm ) Cho phöông trình x2 + 4x + n – 1 = 0 
 a) T×m m ®Ó ph­¬ng tr×nh cã hai nghiÖm ph©n biÖt.
 b) Cho biÕt x1 = 2. TÝnh nghiÖm con l¹i x2 
 c) Tìm giaù trò cuûa m ñeå phöông trình coù hai nghieäm x1, x2 vaø x21 + x22 = 0
Bài làm 
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BiÓu ®iÓm
M· §Ò: 02