1 and 5.07 must be at least (507) 0.0 1 to get an integer.

2. A nine-digit number, in which ten digits, thousands and hundreds of digits are all 8, and all other digits are 0. This number is written as (a) and read as (b).

3.A=2×2×3，B = 2× C× JH5。 Given that the greatest common divisor of A and B is 6, then C is (B) and the least common multiple of A and B is (D).

4、0.375 = =(g)÷24 =(4)% = 1.5:(6)

5. The average of A and B is 24, the ratio of A and B is 5: 3, A is (3) and B is (5).

6. The school bought a football and spent 168. Each basketball is C yuan more expensive than football, and each basketball is (4) yuan.

7. If the number A is equal to the number B, the known number B is 4.2 and the number A is (450).

8. The population of Yuxi Town is about 40,000 in units of "10,000". It is estimated that the actual population is the largest (7) and the least (5).

9. Xiaoli's mother T deposited 5000 yuan in the bank for three years, with an annual interest rate of 2.25% (ignoring the tax rate). The interest due to her is (4,670) yuan.

10, Xiaoming went to the store to buy things. If he buys all his money, he can buy 12 exercise books, and if he buys all his pens, he can buy three. Now Xiaoming can buy eight exercise books first, and then he can buy (r w2) pens.

1 1. Xiaoming bends two iron wires with the length of 14cm at a ratio of 4: 3 (the folding angle is the same), and then puts them into a parallelogram connected end to end. It is known that the area of this quadrilateral is 24 square centimeters and the height of its long side is (24) centimeters.

12. Expand the side of the cylinder to get a rectangle with a length of 18cm and a width of 12cm. The volume of this cylinder may be (9) cubic centimeters or (3) cubic centimeters. (л in this question is about 3)

True or false.

1. There are two leap years in the year (including that year) when Beijing hosted the Olympic Games. (y5)

2. Add three zeros to the end of a decimal, and the size of this decimal remains the same. ( 67 )

3. The score greater than 0.5 and less than 0.7 is only 1. ( 67 )

4.x is even, and 3x must be odd. ( 478 )

5. Saw a 2-meter-long wood into four equal lengths, each of which accounts for the total length of the wood, and each length is 0.5 meters. The time spent sawing each section is all the time. ( 435 )

6. There used to be 4 billion species of life on the earth, but now there are only about 50 million species left, which shows that 97.5% of them. ( 43 )

7. Make a cube with eight small squares of 1 cubic centimeter. If you take a small square, its surface area will remain the same. ( 345 )

Multiple choice problem

1, in the following groups, it is (d) that must not be a set of prime numbers.

A. prime numbers and composite numbers B. odd numbers and even numbers C. prime numbers and prime numbers D. even numbers and even numbers

2. The following fractions cannot be converted into finite decimals (C)

A.B. C. D。

3. If a is a natural number (except 0), the largest of the following formulas is (a).

A.a+b . a \c . a×d . a

4. The original price of a children's bicycle was 154 yuan, but now the price has been reduced, and now the price is (c) yuan.

A. 154×( 1-)

5. Pinch different cylinders with a piece of plasticine, and the bottom area and height of the cylinder (D).

A. directly proportional; Inverse ratio; be disproportionate

6. It is known that the two angles of a triangle are acute angles, and this triangle is (B).

A. acute triangle B. right triangle C. obtuse triangle D. I'm not sure what triangle it is

Calculation of column synthesis formula.

What is the product of (1) 12 minus 30 times the difference of 0.0 1?

(2) Two times a number is 3 and less than 54, so find this number.

Application problems.

2. There is a barrel of oil, 20% was used for the first time, and kg was used for the second time, leaving 1.6 kg. How much does this barrel of oil weigh?

3. It takes 10 hours for Party A to make a batch of parts alone, while Party B can only make this batch of parts in the same time. Find a time for two people to cooperate to complete these tasks?

4. Two cars, A and B, leave Mazhuang Station for Taizhou Department Store at the same time. It takes 20 minutes for A to arrive and 30 minutes for B to arrive. Driving in this way, if two cars start from AB, which is 220 kilometers apart, how many kilometers will they travel when they meet?

5. There are two cylindrical barrels A and B. The radius of barrel A is 10 cm, and the radius of barrel B is 10cm.