Class: Name: Examination Number: Total Grade:

1. Multiple choice questions: (3 points for each small question, * * * 36 points)

1. The number of irrational numbers in the following numbers ().

1。

2. The following mistakes are ()

A.= 0.6 B.=0.6

C.-=- 1.2 D.= 1.2

3. The square root of is ()

A.6 B. 6 C. D

4. The following calculation is correct ()

a . a2 a3 = a6 b . a3÷a = a3 c .(a2)3 = a6 d .(3a 2)4 = 9 a4

5. If x2+6x+k2 happens to be the square of another algebraic expression, then the value of k is ().

a . 9 b . 3 c-3d . 3

6.x4-3x2-4 is the calculation result of which of the following options ()

A.(x2-4)(x2+ 1)