I. Fill in the blanks (20 points)
1, 52098 million is converted into an integer (52098000), and the mantissa after omitting "ten thousand" is about (5209.8).
2. 5.25 hours =( 5) hours (15) minutes.
3. A book has 2 16 pages. On the first day, I read 1/6 of the whole book, and the next day I will start from page (37).
4. 10/ 17, 12/ 19, 15/23, 20/33, 60/ 10 1 0.
5. If 7 subtracts a number and the remainder is multiplied by 7, the result is the same as that after subtracting 1 1.
Multiplied by 1 1, the result is the same, and this number is (18).
6. As shown in the figure, the diameter of the semicircle is 4cm, and the circumference of the semicircle is (10.28) cm.
7. A cuboid and a cube are combined into a big cuboid, and the surface area of this big cuboid is increased by 80 square meters compared with the original cuboid, and the surface area of the original cube is (120) square meters.
8. Saw a cylindrical material into 9 sections, and the sawing time for one section accounts for (12.5 )% of the total sawing time.
9. It is known that five digits 154xy can be divisible by 72, and x+y=(8).
10, in 1, 2, 3, ..., n, m represents all odd numbers, n represents all prime numbers, p represents all even numbers, and q represents all composite numbers. Then (M-N)+(P-Q)=( 1).
Second, multiple-choice questions (put the serial number of the correct answer in brackets) (20 points)
1, a is greater than zero, and a is compared with its reciprocal (d).
A, a must be big; The reciprocal of b and a must be very large; C, must be equal; D, not necessarily equal.
2. Make a rectangle with a 5-meter-long rope, with an aspect ratio of 3: 2 and an area of (D).
A, 6 square meters; B, 5 square meters; C, 2.5m2 d,1.5m2.
3. Cut a rope into two sections, the first section is 3/5 meters; The second section is 3/5 of the total length, compared with (b).
First, the first section; B, section 2; C, the two sections have the same length; D, not sure.
As shown in the figure, please point out that the correct one of the following four answers is (b). (The original title is statistical chart, omitted)
A, the second grade students are the least;
B, there are twice as many boys as girls in grade three;
C, there are more girls than boys in grade four;
There are as many students in Grade Two as in Grade Four.
5. The ratio of 1/3 of number A to 1/4 of number B is 3: 3/4, and number B: number A =( C).
a，4: 1 B，3: 1 C， 1:3 D， 1:4
6. When the working hours are fixed, the number of parts to be processed and the time taken to process a part become (b).
A, in direct proportion; B, inverse proportion; C, disproportionate; D, not sure.
7, a cone bottom area of 6 square decimeter, volume of 6 cubic decimeter, its height is (a).
A, 3 decimeters; B, 1 decimeter; C, 1.5 decimeter; D, 1/3 decimeter.
The three numbers 8, 6, 0 and 2 can form different three digits.
a，4； b，6； c， 12； d，9 .
9. The following statement is correct (D).
A, a ray is 50 meters long; B, true fraction and decimal are less than 1.
C, the tree planting group planted trees in spring 120 plants, all survived, and the survival rate was120%; D, 4x=0 is an equation.
10, the side length of a square and its area (c).
A, in direct proportion; B, inversely proportional; C, out of proportion;
Third, calculation
1, off-type calculation (simple calculation is used if it can be simplified). (16)
( 1) 1/3
(2)99.9*98+(0.8-3/5)*999 9990
(3)2/7 * 1.6÷( 10- 7/8 ÷ 3/ 16) 3/35
(4)( 1234+4567*7890)/(4568*7890-6656) 1
2, column calculation (12 points)
(1)4.2 minus 2.4, divided by 6/7. What is the quotient? 2. 1
(2) 0/3 of 65438+36 is 7 and 4/5 is less than 45% of a number. Find this number. (Solving by Equation) 44
(3) What is the quotient of10 minus 20% and 12? 1.5
Four, the application problem (32 points)
1. The shop sent some fruit. The number of baskets of pears is 3/4 that of apples, and the number of baskets of apples is 4/5 that of oranges. /kloc-how many baskets of oranges did you send for 0/5 baskets of pears?
2. The monthly salary of mom and dad is * * * 7600 yuan. For the first time, my father took out 25% of my salary and my mother took out 20% of my salary and deposited it in the bank. The second father took out 20% of his salary and the mother took out 25% of his salary and deposited it in the bank. As a result, the first time saved 100 yuan more than the second time. What's mom's monthly salary?
3. A bookstore has a preferential rule that if you buy more than 40 books of the same kind, you will pay 80% of the book price. A customer bought two books, A and B, and only A got a discount. The payment for this book is three times that of B, and the number of books in B is two-fifths of that of A ... B is 40 yuan per book. What was the price of Book A before the discount?
4. A three-digit number, divided by 37 equals 5 and then divided by 4 1 equals 1 1, then what is this three-digit number?