62. Let sum be a non-negative integer, and the least common multiple of sum is known as 36.
63. Party A and Party B are at the starting line of100m. Party A stays where it is, and Party B runs to the end of 100 meters at a speed of 7 meters per second. Five seconds later, Party A heard Party B's cry and saw Party B fall to the ground. As we all know, the speed of sound propagation is 340 meters per second. At this time, Party B has run _ _ _ _ _ _ _ meters (accurate to one place).
64. When there is an algebraic expression, the value of the algebraic expression is.
65. As shown in the picture, a square with an area of 50 square centimeters is connected with another square.
It would be nice if you put a small square side by side.
The area is _ _ square centimeters.
66. The six digits 25 52 are all numbers greater than 7, and these six digits can be divisible by 1 1, so there are four digits.
67. Today, there are 1, 2,5 coins * *15, and the value of * * * is 52 cents, so the product of the number of three coins is _ _.
68. If the number of boys in a math group accounts for more than 40% and less than 50% of the total number of the group, then the math group has at least _ _ _ members.
69. Three numbers 1 and three numbers 2 can form _ _ different four digits.
70. Among the three digits, one hundred digits are less than ten digits, and those with ten digits less than one digit have _ _ * digits.
71.100 ∽1999 1900 natural numbers, there are _ _ * ten digits that are the same as single digits.
72. Pythagoras was asked how many students there were in his school. He replied, "Half of the students are studying math, a quarter are studying music, a seventh are resting, and there are three female students left." How many students are there in Pythagoras' school?
A: There are _ _ students in Pythagoras' school.
73. The epitaph on the monument of Diophantu (a Greek mathematician in the second century) records: "The philosopher Diophantu buried here lived a long life, one-sixth of which was childhood, one-twelfth was a teenager, and one-seventh married a bride after his life, and gave birth to a son five years later. Unfortunately, his son only lived half his father's life, and his late father died four years ago. How long did Diophantu live?
A: The life span of Diophantine is _ _ years.
74. A child was asked how many brothers and sisters he had, and he replied, "As many brothers as there are, there are several sisters." Asked his sister how many brothers and sisters she has, she replied, "My brother is twice as old as my sister." Ask how many brothers and sisters they have.
They have _ _ brothers and _ _ sisters.
75. A said to B, "When I was your age, your salary this year was half my age. When you reach my age, I will be twice your age this year and seven years younger. " How old are they now? A: A is _ _ years old and B is _ _ years old.
26. The absolute value of-6 divided by the reciprocal is _ _.
27. expressed by scientific notation: 890000 = _ _ _ _.
28. Use rounding method to approximate 1999.509 (accurate to one place), and the approximate number is _ _.
29. Two rational numbers-12.43 and-12.45 are known. Then, the difference obtained by reducing the number of large numbers is _ _.
30. Known and similar items, then = _ _.
The sum of the negative reciprocal of 3 1 ||| and the reciprocal of -| 4 | is equal to _ _.
32. The effective number of the approximate number 0, 1990 is _ _.
33. The sum of the four numbers A, B, C and D is equal to -90, A is -4, B is +4, C is a multiple of -4, and D is the divisibility of -4, so the largest of the four numbers is greater than the smallest.
34. Given the formula+□ =, the number to be filled in is _ _.
35.( ÷ )÷ ___。
36. It is known that the complementary angle of angle A is equal to 3.5 times of angle A, then angle A is equal to _ _ degrees.
37. Given the equation (1.9x-1.1)-() = 0.9 (3x-1)+0.1,the value of x is _.
38. Building A is 24.5 meters higher than building C, and building B is 15.6 meters higher than building C, so building B is _ _ _ meters lower than building A..
39. As shown in the figure, if the sum of four numbers in four small triangles is equal to zero, then the sum of the absolute values of these four numbers is equal to _ _.
40. Equation sum about x 3mx+7 = 0
2 x+3 n = 0 is the same solution equation, then
x-2y= 1999
The solution of the 4 1. system of equations {is _ _.
2x-y=2000
42. Xiaoming rides a bike from place A to place B, going uphill first and then downhill. It takes 34 minutes to return to place A immediately after arriving at place B. Given that the uphill speed is 400 meters/minute and the downhill speed is 450 meters/minute, the distance from place A to place B is _ _ meters.
43. My father is 24 years older than Xiao Ming, and the age of 1998 is three times that of Xiao Ming in 2000, so Xiao Ming is _ _ years old, 1999.
44. If the known sum is similar, then _ _.
45.and = rules
46. They are all two-person buildings. Given that their minimum common multiple is 385, their maximum value is _ _.
47.A bottle of salt water concentration is 8%, B bottle of salt water concentration is 12%, two bottles of salt water * * weight1000g, A and B bottles of salt water concentration is 10.08%, then a bottle of salt water weighs _ _ _ grams.
48. As shown in the figure, there are _ _ triangles in the five-pointed star.
49. The known rule is _.
50. It is known that the series is 1, 1, 2, 3, 5, 8, 13, ... As the third number, each number is equal to the sum of its two neighboring numbers, then the remainder obtained by dividing the number1999th in the series by 3 is _.
2. The value of1999-is equal to ()
(A)200 1(B) 1997(C)200 1(D) 1999
3. Here are four propositions:
There is only one positive integer (1), and its inverse is the same.
(2) There is only one rational number and its inverse is the same.
③ Only one positive integer has the same reciprocal.
(4) There is only one rational number with the same reciprocal.
The correct proposition is: ()
(A)① and ② (B)② and ③
(C)③ and ④ (D)④ and ①
4.4 The similar item of AB C is ()
(A)4bc a (B)4ca b (C) ac b (D) ac b
The output of a product produced by a factory in July decreased by 20% compared with that in June. If the products in August are to reach the output in June, the output in August will be higher than that in July ()
(A)20% (B)25% (C)80% (D)75%
6. Among the four numbers, the number with the smallest absolute value of the difference between the sum is ().
(A) (B) (C) (D)
7. If x=? , Y=0.5, then x? The value of Y 2X is ()
(A)0 (B) (C) (D)？
8.ax+b=0 and mx+n=0 have the same solution equation about the unknown X, then there is ().
(A)A+m & gt； 0.(B)mb≥an。
(C)mb≤an。 (D)mb=an。
9. The result of (-1)+(-1)-(-1) × (-1) ÷ ().
(A)- 1 (B)
10. In the following operations, the error is ().
(A)2X +3X =5X (B)2X -3X =- 1
(C)2X？ 3X =6X (D)2X ÷4X =
1 1. Known
(A) 2 (B) 1 (C) 0 (D) -2
12. The result of calculating (-1)+(-1) ÷|-1| is ().
(A)0 (B) 1 (C)- 1 (D)2
13. Among the following formulas, the correct one is ().
(1) Answer? a =a . (B)(x ) =x。
(C)3 =9。 (D)3b？ 3c= 9 BC.
The negative reciprocal of the reciprocal of 14. -|-3 | Yes ()
(A)- (B) (C)-3 (D)3
15. 10 month/day, Xiao Ming counted that the average age of everyone is just 38 years old. Grandpa said that these people also got together on October 1st two years ago, so when they got together two years ago, their average age was () years old.
38 (B)37 (C)36 (D)35
16. If a
1 1a(B)- 1 1a(C)-3a(D)3a
17. If the rational number x. y satisfies | 2x- 1 |+(y+2) = 0, the value of x. y is equal to ().
(A)- 1 (B) 1 (C)-2 (D)2
18. The corresponding points of rational numbers A, B and C on the number axis are shown as follows: Then the correct one in the following formula is ().
(A)c + b >; a+b .(C)AC & gt； abdominal muscle
(B)cb <。 ab。 (D)CB & gt； abdominal muscle
19. Inequality < 1 has () positive integer solutions.
2 (B)3 (C)4 (D)5
20. A computer system can only execute one task at a time, and the next task can only be executed after the task is completed. At present, the time of U, V and W is 10 second, 2 minutes and 15 minutes respectively. The relative waiting time of a task is the ratio of the time from submitting the task to completing the task to the time of executing the task by the computer system, so the following four execution sequences make the sum of the relative waiting time of the three tasks minimum.
(A)U，V，W. (B)V，W，U
(C)W，U，V. (D)U，W，V
2 1. As shown in the figure, the lengths of line segments AD, AB, BC and EF are 1, 8, 3, 2, 5, 2 respectively, and the area of closed polyline AEBCFD is S, then the correct one of the following four options is ().
(A) S=7.5 (B) S=5.4
(C)5.4 & lt； S & lt7.5(D)4 & lt； S & lt5.4.
22. The number of participants in the first Hope Cup is 1 10000, and the number of participants in the tenth Hope Cup is 1480000, so the value closest to the average growth rate of participants in the first Hope Cup is ().
2 1.8%。 33.5% (C)45% (D) 50%
23. it is known that x and YI satisfy 3x+4y = 2, x-y.
(A)X= (B)Y=-
(C)X & gt； (D)Y & gt； -
24. The following four sentences are correct ()
A. the greatest common divisor of positive integers a and b is greater than or equal to a.
B. The least common multiple of positive integers A and B is greater than or equal to ab.
C. the greatest common divisor of positive integers a and b is less than or equal to a.
D. the common multiple of positive integers a and b is greater than or equal to ab.
25. Given that a≤2, B ≥-3, c≤5 and A-B+C = 10, the value of A+B+C is equal to ().
10 (B)8 (C)6 (D)4