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The following statement is correct () A. Integers are natural numbers. B. 0 is not natural numbers. C. positive and negative numbers are collectively called rational numbers. D. 0 is an integer rather than a positive number
A. If integers are positive integers, 0 and negative integers, and natural numbers are positive integers and 0, this option is wrong; if B and 0 are natural numbers, this option is wrong; if C, positive numbers, 0 and negative numbers are collectively called rational numbers, this option is wrong; if D and 0 are integers and not positive numbers, this option is correct. Therefore, select D
Zero is ()
A. The smallest rational number B. the smallest positive integer C. the smallest natural number D. the smallest integer
If there is no minimum rational number, a is wrong; if the minimum positive integer is 1, B is wrong; if 0 is the minimum natural number, C is correct; if there is no minimum integer, D is wrong
Every natural number is an integer, but every integer is not necessarily ()
Natural number natural number must be greater than or equal to zero
1 and 2 / 5 (3 / 4 + 2 / 5)
Simple method
Original form
=7/5÷(3/4+2/5)
=7/5÷(15/20+8/20)
=7/5÷23/20
=7/5x20/23
=28 / 23 (28 / 23)
Factorization of 16A ^ 4b-2ab
16a^4b-2ab=2ab(2a-1)(4a^2+2a+1)
This is a common factor in advance and then decomposed by the cube root formula
The fruit shop brought in seven boxes of apples (each box is equally heavy). If you take 25 kg out of each box, the remaining apples will be 5 kg more than the original three boxes
How many kilos does each box weigh
A total of:
25 × 7 = 175 kg
Weight per case:
(175 + 5) / (7-3) = 45kg
Equation 1 is 3x + 7Y = k, and equation 2 is 2x + 5Y = 20. Given that X and y are positive numbers, find the integer K
Calculate X and Y first
I calculated: x = 5k-140
Y=60-2K
Since X and y are positive numbers, then:
5K-140>0
60-2K>0
Solution: 28
How much is a kilogram
One Jin is 500 grams
So one kilogram is two Jin
Two tons of apples were delivered to the fruit shop. Two fifths of the total apples were sold on the first day, and two fifths of the apples were sold on the second day. How many tons?
That is, subtracting the first day's sales from the total, and then subtracting the next day's sales, is the rest
2-2×2/5-2/5
=2-4/5-2/5
=4 / 5 tons
The second way
First calculate the first day after the shipment of the remaining, in the use of the remaining minus the next day to sell, is the rest
2×（1-2/5）-2/5
=6/5-2/5
=4 / 5 tons
I hope I can help you. I wish you progress in your study. If you don't understand, please ask me. If you understand, please adopt it in time! (*^__ ^*)
It takes 15 hours for a master to do a project alone, and 18 hours for an apprentice to do it alone. Now the master will do it for 5 hours, and the apprentice will do the rest. How many hours will it take to complete it?
(1-115 × 5) △ 118, = (1-13) × 18, = 23 × 18, = 12 (hours); a: the rest will be done by the apprentice, and it will take another 12 hours to complete
RELATED INFORMATIONS
- 1. All natural numbers are integers, right
- 2. In the tenth a, a is a nonzero natural number; when a is (), it is an integer
- 3. What are the positive integers of natural numbers? What are the integers? What are the rational numbers? What are the real numbers
- 4. The set of positive integers and negative integers is () A. Set of integers B. set of rational numbers C. set of natural numbers D. none of the above is true
- 5. The average of five natural numbers is 28. If the five numbers are arranged from small to large, the average of the first three numbers is 19, and the average of the last three numbers is 42, What's the number in the middle?
- 6. After three consecutive natural numbers 1, 2, 3 are removed, the average of the remaining numbers is 19 and 8 / 9 If there are exactly two primes in the number, what is the maximum sum of the two primes?
- 7. The sum of four continuous natural numbers is 19 / 20. What is the average of four continuous natural numbers
- 8. The four numbers 0 1 2 3 can be used to form one bit integer, two bit integer, three bit integer and four bit integer There are () natural numbers which are multiples of 3
- 9. The last three digits of the product of a natural number multiplied by 17 are 123. What is the smallest integer?
- 10. All natural numbers are integers, and all integers are natural numbers______ (judge right or wrong)
- 11. The reciprocal of non-zero natural numbers is smaller than 1______ ．
- 12. If the number on a digit of a natural number is 0 or 5, then the number must be a multiple of 5 (2) All even numbers except 2 are composite numbers (3) Even numbers are not multiples of 2 (4) A three digit number composed of 1, 3 and 5 must be a multiple of 3 (5) In nature books, except prime numbers, the rest are composite numbers (6) At least one of three continuous natural numbers is a composite number (7) 1 is the factor of any non-zero natural number (8) Because 8x5 = 40, 8 and 5 are factors and 40 is a multiple (9) The sum of two odd numbers must be even (10) The multiple of a number must be greater than its factor
- 13. Natural numbers, integers, etc. What are the definitions of these numbers? I immediately went to senior one, suddenly found some primary school nouns do not understand 1: Integers 2: Natural number 3: Rational and irrational numbers 4: Real and imaginary numbers 5: Plural 6: Common divisor and common multiple 7: Even number and odd number (this can not be explained)! I hope you can tell me what the definition of these numbers is? For example, it would be better! I also forgot which * * numbers are still available in primary schools! If there are any, please answer!
- 14. The mathematical problem expresses n as the product of four natural numbers less than 1 Given n = 88... 8 (1000) 00... 0 (1000), what is the product of 4 natural numbers greater than 1?
- 15. "The difference between unit" 1 "and natural number 1"
- 16. Is o an integer or a natural number? The denominator of a fraction must be an integer
- 17. Who can tell me the strict definition of various numbers in mathematics, such as rational number, imaginary number, natural number and so on
- 18. What is the value of m.n? (x ^ 2 + MX + 3) (x ^ 2-3x + n) does not contain x ^ 2 and x ^ 3?
- 19. If the equation (the absolute value of K-2) x ^ 3 + kx-k ^ 2 / 2 = 0 about X is a linear equation of one variable, then k =? X =?
- 20. If the absolute value of 3-2k of (K-2) x + 2K = 4 is a one variable linear equation of X, then k =? As soon as possible, as soon as possible