2. The volume of a cylinder is three times that of a cone, and the base and height of the cone must be equal. ( )
3. Proportion is the ratio of the previous paragraph to 1. ( )
4. 1 kg metal ratio 1 kg cotton weight. ( )
5.1100 and 1% are fractions with denominator of100, which have the same meaning. ( )
6. The volume of a cone is two thirds smaller than that of a cylinder. ( )
7. Two rays can form an angle. ( )
8. After a rectangular wooden frame is drawn into a parallelogram, the sum of the internal angles of the four corners remains unchanged. ( )
9. In any cuboid, only two opposite faces are completely equal. ( )
10, two rectangles with equal perimeters must also have equal areas. ( )
1 1, an object with a volume of 1 cubic decimeter must have a bottom area of 1 cubic decimeter. ( )
12. The bottom area of a cube with a volume of 1 cubic decimeter must be 1 square decimeter. ( )
13, the working efficiency is inversely proportional to the working time. ( )
Original term 14 increased 10%. To keep the proportion unchanged, the latter term should be multiplied by 1. 1. ( )
15 and 5 kg of salt are dissolved in 100 kg of water, and the salt content of brine is 5%. ( )
16, with large scale and large actual distance. ( )
17. If the perimeter of a square is equal to the perimeter of a circle, the area ratio of the square to the circle is ∏ 7: 4. ( )
18, the smaller the decimal value, the smaller the decimal unit. ( )
19, 7m 1/8 is as long as 8m 1/7. ( )
20. Two disjoint straight lines are called parallel lines. ( )
2 1, Xiao Wang processed 99 parts, 99 of which were qualified, and the qualified rate of these parts was 99%. ( )
22. Five workers process five parts in five hours, so 1 worker processes 1 part in 0 hours. ( )
23. Adding two zeros to the end of a number will enlarge the original number by 100 times. ( )
24. There are 365 days in a year. ( )
25. The area at the bottom of the cylinder is expanded by 3 times and the volume is expanded by 3 times. ( )
26. 12/ 15 cannot be converted into a finite decimal. ( )
27. Numbers divisible by 3 must be divisible by 9. ( )
28.a, B and C are three natural numbers (and not equal to 0), in a = b× c.
A and b must be divisors of a ()
B and c must be the greatest common divisor of a and B. ()
C and a must be the least common multiple of a and B. ()
D and a must be common multiples of b and c. ()
29. The sum of two acute angles must be obtuse. ( )
30. In proportion, if two internal terms are reciprocal, then two external terms are reciprocal. ( )
3 1, the words "net content: 250 ml" are on the "Guangming" milk packaging box, and this 250 ml refers to the volume of the packaging box. ( )
32, x+y=ky(k must), then x and y are out of proportion. ( )
33. The same road takes 5 hours for Party A and 4 hours for Party B.. The speed ratio between Party A and Party B is 5:4. ( )
34. An angle greater than 90 is an obtuse angle. ( )
35. As long as this number is divisible by 2, it is even. ( )
The fifth grade mathematics judgment questions Volume 1 1. The arithmetic of integer multiplication is also applicable to fractional multiplication. ()
2. Decimals are not necessarily smaller than integers. ( )
3. Divide by two decimal places. If the quotient is greater than the dividend, then the dividend must be greater than 1. ( )
4. When two numbers are divided, the quotient is 0.8. If the divisor is reduced by 10 times, the quotient is 0.8. ( )
The meaning of decimal multiplication is exactly the same as that of integer multiplication. ()
6. The meaning of fractional divisor is the same as that of integer division. ()
7.4x-b=0 is not an equation.
8. Equation 2x = 0, and the value of x is 0. ()
9. A trapezoid consists of two parallelograms. ()
10. Two triangles with identical shapes can be combined into a parallelogram. ()
1 1. Three children play checkers. It is fairest for them to decide who will play chess first by flipping a coin. ( )
12.26.84+34.6÷0.2×4=26.84+34.6÷0.8=26.84+
43.25=70.09 ( )
13. The solution of equation 2.5+3+x = 9 is 0.5. ()
When a number 14 is divided by a number greater than 1, the quotient must be less than the original number. ( )
15 is 2.3 times of a number, which is greater than the original number. ( )
16.0.2 hours equals 20 minutes. ( )
17. When a number is divided by a decimal, the quotient must be greater than the dividend.
18. The cyclic decimal must be an infinite decimal, so the infinite decimal must also be a cyclic decimal.
19.4.054054 ... written by simple circulation method: 4.05. ( )
20. If the dividend is expanded by 100 times, the divisor must be multiplied by 100 to keep the quotient unchanged. ()
When 2 1. represents an approximation, 8.0 is more accurate than 8. ( )
22. Because a+b=c is both an equation and an unknown, it is an equation. ( )
23. Find the sum of 65438+4 and 0.25 times of x, and the formula is (4+X) × 1.25. ()
24.b+ b+ b=3 b .()
25. If a=2a, then a can only be 2. ( )
26.6.3 ÷ 0.12 = (6.3× 8) ÷ (0.12× 8) This is simplified by the inconvenient nature of quotient. ( )
27. The sum of three times a certain number and five times this number is 44.8, and the equation is 3 ⅹ+5 ⅹ = 44.8. ()
28. The area of a trapezoid is equal to half of a parallelogram. ( )
29. Two right-angled triangles can be combined into a rectangle or parallelogram. ( )
30. The area of a triangle is 15㎝2, so the area of a parallelogram with equal base and equal height is 30㎝2. ( )
3 1. If the base of a triangle remains unchanged, its height will be doubled and its area will be doubled. ( )
32. The base and height of a parallelogram are equal. If the base increases 1㎝ and the height decreases 1㎝, the area of the parallelogram obtained is equal to that of the original parallelogram. ( )
33. The median of a set of data may be equal to the average. ( )
34. To solve the equation 2- 1.5 x =10, first consider 2-1.5 as a number. ( )
35.0.2÷0.3 has two decimal places, which is about 0.67. ( )
36
The calculation results of 0.9×4 and 4×0.9 are the same, but their meanings are different. ( )
37.x can be abbreviated as 2 X. ()
38. Parallelograms with equal bases and equal heights have equal areas. ( )
39. because A \b = 0.5, a
40.0.76×99=0.76× 100- 1。 ( )
The first volume of the fifth-grade primary school students' mathematics newspaper requires you to ask questions on the topic first, so that everyone can help you. Who has a pile of reference books with him for future reference? Know what regional exam questions, how many pages are there in the book, how many pages are there in the so-and-so Olympic math question, and what regional prestigious school project software, etc. Think about how others can help you before giving the question. Besides helping you think, do you have to spend money on books to help you answer questions? The last photo or picture won't? Or the problem can't be clarified?
Pupils' answers to the first volume of the fifth grade mathematics newspaper are highly dependent on the answers because of their low self-control ability and poor foundation. You can't ask the answer online.
On the contrary, this situation requires independent thinking and learning to make progress.
Primary school students' fifth grade mathematics volume I, 76 pages, 8 questions. How? There are many kinds of math books. .
We don't have any books. .
At least send out the questions.
Pupils will make mistakes when judging math problems.
The units of perimeter and area are different and cannot be compared.
This question is correct.
You can do it. If he is right, half of the 4-meter-long rope is used. One meter is 1/2× 4+ 1 = 3 (meters), and the remaining 4-3= 1 (meters). He is also the last meter, so he is right.
Leap years are divisible by 400. Remember that there are two zeros behind it, so divide by 400. 2 100 is not divisible by 400, so it is not.
If the math judgment in the second volume of the fifth grade of primary school is wrong, about 8/ 12 is equal to 2/3.
Find out the math judgment questions (3 questions) in the second volume of the fifth grade of primary school. I found three problems in the fifth grade book. Look, this is actually very easy to judge, as long as you give an example.
1, the sum or difference of any two odd numbers must be even. That's right. For example: 3+3 = 8, 3 = 7 =101-1=10.
2, a number is a multiple of 2 and 5 at the same time, and the number on these digits must be 0. That's right. For example: 30, 50
If a is used to represent a natural number, then 2a must be an even number. That's right. For example, 2*4= 12 2*7= 14.