kt toan 9 - Các công cụ toán học - Đào Quang Đại - Thư viện Đề thi & Kiểm tra

Líp 9… Häc sinh:……………………………….

KiÓm tra m«n: ®¹i sè Bµi sè 4 –

( Thêi gian: 45 phót )

§iÓm Lêi phª cña gi¸o viªn

I - tr¾c nghiÖm (3 ®iÓm)

Khoanh trßn chỉ một chữ c¸i in hoa đứng trước c©u tr¶ lêi ®óng

Baøi 1. (1 ñieåm) Cho haøm soá 2

x

2

1

y  . Keát luaän naøo sau ñaây laø ñuùng?

A. Haøm soá treân luoân nghòch bieán B. Haøm soá treân luoân ñoàng bieán

C. Giaù trò cuûa haøm soá bao giôø cuõng aâm D. Haøm soá treân nghòch bieán khi x>0 vaø ñoàng bieán khi x<0

Baøi 2. (1 ñieåm) Phöông trình x2

– 5x – 6 = 0 coù moät nghieäm laø

A. x = 1; B. x = 5; C. x = 6 ; D. x = -6

Baøi 3. (1 ñieåm) Bieät thöùc ' cuûa phöông trình 4x2

– 6x – 1 = 0 laø:

A. ' = 5; B. ' = 13; C. ' = 52 ; D. ' = 20

II – tù luËn (7 ®iÓm)

Baøi 1.(3 ñieåm) Cho hai haøm soá y = x2

vaø y = x + 2

a. Veõ ñoà thò caùc haøm soá naøy treân cuøng moät maët phaúng toaï ñoä.

b. Tìm toaï ñoä giao ñieåm cuûa hai ñoà thò ñoù.

Baøi 2. (2 ñieåm) Giaûi caùc phöông trình.

a. 2x2

– 5x + 1 = 0 b. -3x2

+ 15 = 0 c. 3x 4 6x 4 0

2

  

Baøi 3. (2 ñieåm) Tính nhaåm nghieäm cuûa caùc phöông trình

a. 2001x2

– 4x – 2005 = 0 b.2 3x 3x 2 0

2

    c. x2

– 3x – 10 = 0

Bµi lµm

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