1, a barrel of oil, the barrel weight is 3 1.4 kg, and one fifth of the oil is used, the barrel weight is 26.4 kg, and the barrel weight is 1 kg.

2. The ratio of 1.2m and 30cm is (), and the simplest integer ratio is ().

3. Given that the radius of a small circle is 2 cm and the radius of a big circle is 4 cm, the ratio of the circumference of the small circle to the circumference of the big circle is (), and the area ratio is ().

4、( )÷ 12= = 12:( )=( )

5. The length-width ratio of a rectangle is 5: 3, and the length is 8 cm more than the width, so its circumference is () cm.

6. In the picture on the right, a * * has a triangle (). 7. Fill in the numbers according to the law: 1, 1, 2,6,24, () 720.

8. Wang Ming went to the shoe store and bought a pair of shoes 188 yuan. This pair of leather shoes is sold at a 20% discount on the list price. The price of this pair of shoes is () yuan.

9. If aaaa times 7 equals 2bbb 1, then a= () and b= ().

10, has a simplest fraction, and its molecule plus 1 equals; If the denominator is added with 1, it is equal to the fraction ().

1 1. Move the decimal point two places to the right. The sum of this number and the original number is 124.23. The original decimal point was ().

12,+=, and a < b, then A= () and B= ().

13. Hard-working rabbits line up, and one of them is a little black rabbit. From the front, the little black rabbit is the ninth, and from the back, the little black rabbit is the first 10. There are only () rabbits in this team.

14, decompose natural numbers A and B into prime factors to get a=2×5×7×m and B = 3× 5× m. If the least common multiple of A and B is 2730, then m= ().

Second, multiple-choice questions (* *15)

1. When Wen Qiang's father went to the railway station, he walked for 4 minutes and ran for 5 minutes. I walked for 6 minutes and ran for 4 minutes and 20 seconds when I came back. Then the speed ratio of Wen Qiang's father's walking and running is () (1)1:2 (2)1:3 (3).

Both a and b are natural numbers. If 19× > 19 ÷, compare a and b ().

(1)a is big (2)b is big (3) equally big (4) I'm not sure who is big.

3. The right sides of a right triangle are 3cm and 4cm respectively. Observe this triangle with a magnifying glass, and its area is () square centimeters.

( 1)6 (2) 12 (3) 18 (4)24

4. Add 3 to each digit of a four-digit number to get a new four-digit number. The new three-digit number is 1, which is more than three times of the original four-digit number, so the new four-digit number is ().

( 1) 1666 (2)3333 (3)3334 (4)9999

5. For two numbers A and B, define an operation "*" A * B = 3a-2b, then 3 * 5 = () (1)19 (2)15 (3) 6 (4) 5.

Three. Calculation (*** 16 points)

( ×2.232+ 1.768× )+32× + ×25%+ ×

(1+2+8) ÷+...++...+four. Comprehensive formula of column (2 points× 5 =10 point)

What is the quotient of the sum of 1 divided by their difference? 2. 80% of a number is greater than 45. What is the number? 3. What is the quotient of the difference obtained by subtracting 0. 125 from the product of its reciprocal? After subtracting a number from it, the remainder is divided by 7. As a result, what is this number? 5, a wire 17 1 m, the first time to cut off the full length, the second time to cut off 3 meters less than the first time, how many meters to cut off twice? Five, the application problem (5 points ×6=30 points)

One-year-old tortoise asked his mother: When can I be as big as you? Mom told him: When you reach my age, I will be 19 years old. Do you know how old mother turtle is now?

The Zhang family cleaned up a fish pond. In order to know how many fish are in the pond, he waved 100 fish for the first time, marked each fish and put it into the water. When they were completely mixed with fish, he waved 200 fish, including 20 marked fish. How many fish are there in this fish pond?

3. When the math test paper was handed in, I got 6 points for doing the right question and 4 points for doing the wrong question. If I didn't do it, I didn't give points or deduct points. Xiaoming got 94 points in this exam. How many questions did he make wrong?

As shown in the figure, a big square is surrounded by four identical right triangles and a small square. If the right-angled sides of a right-angled triangle are known to be 3 cm and 4 cm respectively, what is the area of the big square surrounded by it?

The kitten went fishing by the river. On a sunny day, she fished nine fish a day, while for six days, she fished seven fish a day on average. So, how many sunny days are there?

6. As shown in the figure, ABC is an isosceles right triangle, D is the midpoint of the semicircle, and BC is the diameter of the semicircle. Given AB=BC= 10 cm, what is the shadow area?

Six, ask questions (***9 points)

1. Put 1 140 books on a five-story bookshelf. Every time you go up, you will lose 15 books. So, how many books should be put on each floor? (4 points) 2. Four steel balls, A, B, C and D, are weighed with two scales and * * * is weighed six times. The heaviest ones are B and C, the lightest ones are A and D, followed by A and B. Please list these four steel balls in order of weight. (5 points)