Kiểm tra chương IV đại số 7

Hoï vaø teân :...................................................................... KiÓm tra ch­¬ng iv
 ®¹i sè 7
Lôùp : 7 	 Thôøi gian : 45 phuùt 
 
 I . Traéc nghieäm : (3ñ)
Caâu 1: Tích cuûa 3x2y3 vaø (3xy2) laø :
	a/ 6x3y5 	b/ 3x2y	c/ -6x3y5	d/ 9x3y5
Caâu 2: Nghieäm cuûa ña thöùc 2x + 6 laø:
	a/ x = 3 	b/ x = - 3 	c/ x = 6	d/ Moät keát quaû khaùc 
Caâu 3: Cho caùc ñôn thöùc A = ; B = ; C = -2x2y ; D = xy2 , ta coù :
a/ Boán ñôn thöùc treân ñoàng daïng nhau 	c/ Hai ñôn thöùc A vaø B ñoàng daïng nhau
	b/ Hai ñôn thöùc A vaø C ñoàng daïng nhau 	 d/ Hai ñôn thöùc D vaø C ñoàng daïng nhau
Caâu 4: Trong caùc bieåu thöùc sau , bieåu thöùc naøo laø ñôn thöùc :
a/ 2x – 3	b/ 4x + y	c/ 7(x + y) 	d/ 4x2y3 
Caâu 5: Ñôn thöùc ñoàng daïng vôùi ñôn thöùc 3x2y laø :
	a/ x2y	b/ -2xy2 	c/ 3x2y2 	d/ 3xy 
Caâu 6: Keát quaû cuûa 2x2y - 5x2y laø ;
	a/ -3xy2 	b/ 3x2y	c/ -6x3y5 	d/ Moät keát quaû khaùc 
	
 II. Töï luaän : (7ñ)
Baøi 1: Thu goïn ñôn thöùc sau: . 
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Baøi 2: Tìm nghieäm cuûa ña thöùc : f(x) = 3x – 9 
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...................................................................................................................................................................................................................................................................... Baøi 3: Cho hai ña thöùc M(x) = 3x4 – 2x3 + 5x2 – 4x + 1 vaø N(x) = -3x4 + 2x3 –3x2 + 7x + 5
	a/ Tính toång cuûa M(x) + N(x) 
	b/ Tính hieäu N(x) - M(x)
	c/ Tính giaù trò cuûa bieåu thöùc toång taïi x = -1 
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