Kiểm tra 45 phút Đại số 7 - Chương I

Tröôøng THCS . . . . . . .
Hoï vaø teân hoïc sinh:
.....................................................
Lôùp 7A

Thöù ngaøy thaùng naêm 2009
KIEÅM TRA ÑAÏI SOÁ - CHÖÔNG I
Thôøi gian: 45 phuùt
ÑIEÅM
I/ PHAÀN TRAÉC NGHIEÄM: (3ñ)· Khoanh troøn chöõ caùi ñöùng tröôùc caâu traû lôøi ñuùng.
1) keát quaû laø: a. 	 b. 	c. 	d. 
2) keát quaû laø:	 a. 1	 b. 	 c. 2009	d. 
3) coù keát quaû laø:	 a. 8	 b. 	 c. 	d. 
4)Neáuthì x baèng:	 a. 121	 b. 	 c. 22 	d. 
5) Neáu x + y + z = 20 vaø . Thì giaù trò cuûa x ; y; z laàn löôït laø:
a. 	 b. 	 c. 	 d. Moät keát quaû khaùc
6) Khi laøm troøn ñeán chöõ soá thaäp phaân thöù ba thì keát quaû laø: 	
a. 5,473	 b. 5,474	 c. 5,475	 d. 5,478
II/ PHAÀN TÖÏ LUAÄN: (7ñ)
Baøi 1: ( 2ñ ) Thöïc hieän pheùp tính theo caùch hôïp lí nhaát :
a) b) 
==
c) 	 d) . 
==.
Baøi 2: ( 1,5ñ ) Tìm x bieát:
a) ; 	 b) ; c) (x -1)3 = 27
Baøi 3: ( 2,5ñ ) Sè viªn bi cña ba b¹n Minh, Nam, Hoµng tØ lÖ víi c¸c sè 2; 4; 5. TÝnh sè viªn bi cña mçi b¹n, biÕt r»ng ba b¹n cã tÊt c¶ 99 viªn bi.
Baøi giaûi:
......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Baøi 4: ( 1ñ ) Tìm giaù trò nhoû nhaát cuûa bieåu thöùc sau:
..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................