There are also: minimum common factor, maximum common multiple, prime number, prime number, composite number and so on. ...
Questions to be given: multiple choice questions
1, if the square of a number is equal to its reciprocal, then the number must be ().
A, 1 B,-1 C, 0 D, 1 or-1.
2, the following conclusion is correct ()
A, if a≠b, a2≠b2 B, if a > b, a2 > b2c, if a > b, D, if a2 = b2, a = b or A =-B.
3. The following statement is wrong ()
A the similarity values of 0.8 and 0.80 have different meanings. B. Similar number 0.2000 has four significant figures.
C, 4.450× 104 is the divisor d with precision to ten digits, and 49554 is with precision to ten thousand digits, which is 4.9× 104.
4. The solution of the equation | x- 1 | = 2 is ().
A,-1 B,-1 or 3 C, 3 D, 1 or -2.
5, the following survey is applicable to the way of census ()
A, a factory manufactures a scale, and it is necessary to check whether the length of this batch of scales is qualified.
B, in order to investigate the weight of the students in this class.
C, know the hourly power consumption of a refrigerator.
D, there are 20,000 students in a city taking the senior high school entrance examination, in order to know their math scores;
As shown in the picture, four students, A, B, C and D, are sitting in four different directions of a square table. They see that the pattern on the desktop is "A" ().
A，A B，B C，C D，D
7. A dice consists of six numbers: 1 ~ 6. Please check according to A, B and C in the figure.
The number is displayed in three states, press "?" The number of is ()
a、6 B、3 C、 1 D、2
8. A glass ball pops up from point A, rolls 3 meters to the left, touches the wall, bounces back 5 meters in the direction and stops moving, then the glass ball is at point A ().
A, 2m b on the left, 2m c on the right, 8m d on the left and 8m on the right.
9, if the point is away from the midpoint of the line segment AB, the following conclusion is wrong ()
a、AC=BC B、AC= AB C、AB=2BC D、AC=2AB
The complementary angles of 10 and ∠A and ∠A are complementary, so 2∠A is ().
A, acute angle b, right angle c, obtuse angle d, all three are possible.