Where has 07 year (people's Education Edition) the first day mathematics positive and negative number examination paper (takes the answer) thank you~
Rational number exercise 1 (Level B) (1) calculation: (1) 23 + (- 73) (2) (- 84) + (- 49) (3) 7 + (- 2.04) (4) 4.23 + (- 7.57) (5) (- 7 / 3) + (- 7 / 6) (6) 9 / 4 + (- 3 / 2) (7) 3.75 + (2.25) + 5 / 4 (8) - 3.75 + (+ 5 / 4) + (- 1.5) (2) simple calculation: (1) (- 17 / 4) + (- 10 / 3)
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- 3. 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
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- 11. 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
- 12. 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,
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- 19. 2 2 (y-2013) + (y-2010) = 4035 (y-2013) (y-2010) =?
- 20. Second grade mathematics application problem (set element, column equation and equation solution) thank you ~ mathematics good help Ha, very difficult 1. a factory plans to complete the production tasks of 3 million machines within a certain period of time. After adjusting the original plan, the total amount will increase by 20% on the basis of the original plan and 6 months ahead of schedule. It is estimated that the new plan must be produced 50 thousand times more than the original plan. 2. Xiaojie deposits the 400 yuan earned by work study program into the bank one year at a fixed time. When it matures, he takes out 50 yuan to buy school supplies. The remaining principal and interest are all used to buy a one-year bond. The annual interest rate of the bond is 2.5 percentage points higher than that of the deposit. In this way, Xiaojie can get a total of 378 yuan of principal and interest after the maturity, and calculate the annual interest rate of the bond. (excluding interest tax) 3. A section of road maintenance project on a certain highway is ready for external bidding. There are two engineering teams a and B bidding, and the bidding information says: if the two teams cooperate, it can be completed in six days, and the total project cost is 10200 yuan; if they are completed alone, team a will spend five days less than team B, but team a will spend 300 yuan more than team B, so as to save money. Choose one team, which team