1, the "Dawning 3000 Super Server" developed in China, its peak calculation speed reaches 403,200,000,000 times per second, which can be expressed as () by scientific counting method.
A.4032× 108 b . 403.2× 109 c . 4.032× 10 1 1d . 0.4032× 10 12
2. The following four figures are each composed of six identical small squares, and the one that can be folded into a cube is ().
3. In the following groups, the equal group is ()
A.- 1 and -4+(-3) B. |-3| and -(-3) C. 3x2-2x=x D. 2x+3x=5x2.
The time difference between Paris and Beijing is -7 (a positive number means that the same moment is several hours earlier than Beijing). If Beijing time is July 2nd 14: 00, then Paris time is ().
A. July 2nd 2 1 point B. July 2nd 7 o'clock C. July 1 point 7 o'clock D. July 2nd 5 o'clock.
5. The tax payment method of deposit interest stipulated by the state is: interest tax = interest ×20%, and the bank's one-year fixed interest rate is 2.25%. When Xiao Lei took out the principal and interest due in one year, he paid the interest tax in 4.5 yuan, so the money Xiao Lei deposited in the bank a year ago was
A. 1000 yuan B. 900 yuan C. 800 yuan D. 700 yuan ()
6, a brand of color TV after 30% price reduction, each price is one yuan, then the brand of color TV each price is ().
A.0.7a yuan B. 0.3a yuan C.D.
7. In the angle formed by two intersecting lines.
A. there must be an obtuse angle B. there must be an acute angle C. there must be a non-obtuse angle D. there must be two acute angles.
8. In order to make people feel the impact of discarded plastic bags on the environment, six students from an environmental protection group recorded the number of discarded plastic bags in their homes in one class. The results are as follows: 33 25 28 26 25 3 1. If there are 45 students in this class, according to the data provided, it is estimated that the total number of discarded plastic bags in all classes this week is about ().
a . 900 b . 1080 c . 1260d . 1800。
9. If the equations about x 3x+5 = m and x-2m=5 have the same solution, then the value of x is ().
A.3b–3c–4d
10, known as │m+3│+3(n-2)2=0, then the value of m n is ().
A. 6th century BC to 9th century BC
1 1. The following statement is true ()
A through a point outside a straight line, countless straight lines can be made parallel to known straight lines. B. Passing a point can make countless straight lines perpendicular to known straight lines.
C. only two straight lines pass through two points. D. between two points, the line segment is the shortest.
12, in the cross section of the cube, the polygon with the largest number of sides is ().
A. quadrilateral pentagon hexagon heptagon
Second, fill in the blanks
13. When calculating 4×(0.2-3)+(-2)4 with a calculator, the order of keys is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
14, calculate 5136 ˊ = _ _ _ _ _
15, Zhang bought a newspaper from the newspaper at the price of 0.4 yuan, sold B newspapers at the price of 0.5 yuan, and returned the rest to the newspaper at the price of 0.2 yuan, so Zhang's newspaper sales revenue was _ _ _ _ _ _ _ _.
16, known: As shown in the figure, the line segment AB=3.8㎝, AC= 1.4㎝, D is the midpoint of CB, and A C D B is DB =?.
17, let the number of faces of a cuboid be f, the number of sides be v and the number of vertices be e, then f+v f+v+e = _ _ _ _ _ _ _ _
18. Use black and white hexagonal floor tiles to spell out several patterns according to the following rules: then there are _ _ _ _ _ _ _ _ white floor tiles in the fourth pattern; No, no.
(1) (2) (3) There are _ _ _ _ _ _ _ blocks of white floor tiles.
19. There are five white balls, four yellow balls and 1 red ball in a bag (each ball is the same except the color), so the chances of touching _ _ _ _ _ _ _ balls are the least.
20. It costs less money in 2 yuan to buy 10 kg eggs at a time at a 20% discount than at a 10% discount, so the original price of 10 kg eggs is _ _ _ _ _ _ _.