1, the cube of a number equals itself, and this number is ().

a、0 B、 1 C 、- 1、 1 D 、- 1、 1

2, in the following categories, is not equal to ()

A, (-3) 2 and -32b, (-3) 2 and 32 C, (-2) 3 and -23d, |-2 | 3 and |-23 |

3、(- 1)200+(- 1)20 1=( )

a、0 B、 1 C、2 D 、-2

4. There is a set of numbers:-1, 1/2,-1/3, 1/4,-1/5, 1/6 ... The seventh number is ().

a 、- 1/7 B、 1/7 C 、-7 D、7

5. The following statement is correct: (a) The absolute value of rational number must be positive.

B, if the absolute values of two numbers are equal, then the two numbers are equal.

C, if a number is negative, then the absolute value of this number is its reciprocal.

D, the greater the absolute value, the greater the number.

6. Comparing the sizes of-1/5 and-1/6, the result is ().

A, > b, < c, = d, uncertain.

7, the following statement is wrong ()

Zero divided by any number is zero. The absolute value of the reciprocal of b and -7/9 is 9/7.

C, the opposite number is equal to its own number is zero and all positive.

Dividing by a number is equal to multiplying by its reciprocal.

8, (-m) 10 1 > 0, there must be ().

A, m > 0 b, m < 0 c, m = 0 d, all of the above are incorrect.

9. Compared with its reciprocal 1/n, the reciprocal of a positive integer n is -n, and the correct one is ().

a 、-n≤n≤ 1/n B 、-n< 1/n