Five step calculation of plus and minus of positive and negative numbers We need 20 additions and subtractions

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• 1. Pack oranges in baskets with 30kg as the standard. The excess kilogram is a positive number and the insufficient kilogram is a negative number. The weighing records are as follows: 5, - 4, + 1, 0, - 3, - 5, + 4, - 6, + 2, + 1? How many kilos are 10 baskets of oranges?
• 2. An applied problem of positive and negative numbers in Mathematics If a mineral water bottle is marked with the words "550 ± 5 (ML),", This is my homework to hand in~
• 3. A formula for adding and subtracting negative and positive numbers!
• 4. Addition, subtraction, multiplication and division of negative and positive numbers Is it - 22 / 11 = - 2
• 5. Use letters to represent the following operation laws; the rational number subtraction law a-b=
• 6. Positive minus negative, negative minus positive are equal to what number (positive and negative number)
• 7. Who can tell me the rules of positive plus negative, negative plus positive, positive minus negative, negative minus positive? It's better to give another example
• 8. Positive minus negative Why subtracting a negative number equals the opposite of adding a negative number Case 7 - (- 3) = 7 + 3
• 9. Is it right to add a negative number equal to minus the corresponding positive number and subtract a negative number equal to plus the corresponding positive number? —3 — —5 =
• 10. How to calculate negative minus negative -1613-（-2700）=?
• 11. Solving 30 plus and minus problems of positive and negative numbers Example: 13-15 + (- 12) - (- 13) Such questions Trouble
• 12. On positive and negative numbers in the first day of junior high school There are two points a and B on the vertical axis. The distance between a and B is 1, and the distance between a and origin 0 is 3. Find the sum of the distances between B and origin that meet the conditions? (Note: the distance in the question can be positive or negative.) The wrong type is the number axis, not the vertical axis
• 13. About positive and negative numbers There are four numbers: 3, - 5,7, - 13. Through calculation, we can calculate 24,,,, addition, subtraction, multiplication and division, as well as brackets, as long as we can get 24. It's better to have a variety of algorithms, one of which can also
• 14. Exercises on addition of positive and negative numbers I need it urgently,
• 15. Where has 07 year (people's Education Edition) the first day mathematics positive and negative number examination paper (takes the answer) thank you~
• 16. Introduction to positive and negative numbers in grade one of junior high school 1. Scientific experiments show that the charge of the nucleus and the electron in the atom is opposite. The charge of the nucleus is positive. The nucleus and the electron in the hydrogen atom each have one charge. The charge is expressed by positive and negative numbers The answers on the fourth floor are more complete
• 17. Starting from - 35, add one by one to get a series of integers: - 34, - 33, - 32, - 31 (1) What is the 50th integer in the string? (2) Find the sum of fifty integers The second question is, do you have any formula? If so, please add an explanation,
• 18. Kneeling for 40 seventh grade plus and minus mixed operation exercises Urgent & nbsp; there are good ones to give you bonus points
• 19. Can teach me how to learn the multiplication, division, addition and subtraction of the positive and negative numbers in grade one, I am very poor in mathematics now, even the mathematics teacher asked me to find the teacher to make up for it
• 20. First, the equations are listed to solve the application problems, and then according to the equations listed, an application problem of the travel problem is compiled, Do 48 per hour, B do 70 per hour, a first do an hour later, has been in cooperation with a, asked how many hours to complete the task? Seeking process