At 1, 2, 3 , 200620072008, add "+" or "-" arbitrarily before, and calculate in order. Can the sum of these numbers be equal to 2008?

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• 1. At 1, 2, 3 Add "+" - "before, 2006, 2007, 2008 and calculate in order, will the result be equal to 2008
• 2. What is one plus two plus three plus four plus five all the way to 100 Add with the beginning and end
• 3. The second power of (a-b) - (a-b) - 2 is equal to?
• 4. When n is odd, H = 3N + 13, when n is even, H = NX1 / 2x1 / 2 Where h is an odd number. How many times does 7 equal after 2010?
• 5. Read in even numbers (c), and some of the odd number of integers for the end of the language
• 6. To make the output value y greater than 100, what is the minimum positive integer x? Even number * 5 of positive integer equals output y; odd number * 5 + 13 of positive integer x equals output y
• 7. A is an odd number, B is an even number, the following result is that the odd number formula is () A. 3a+bB. 2a+bC. 2（a+b）
• 8. The sum of 1 to 50 is odd or even
• 9. How many odd and even numbers do vb use for loop to calculate 1-100?
• 10. Odd number, odd number, even number, odd number who can help me analyze what it means In the quantity relation, the circle problem, the rule says: if there is an odd number in a circle, there are odd numbers If there are even odd numbers in each circle, then Who can help me analyze what it means
• 11. Pressure formula of the third year of junior high school What about the pressure
• 12. Junior high school physics, pressure There is a beaker with a volume of 1000ml and a volume of 200ml. At this time, the pressure and pressure of water on the bottom of the beaker is f, P, and the pressure and pressure of the cup on the table top is f1.p1. When a piece of wood is put in, the pressure and pressure on the bottom of the beaker and the table top are calculated, Thank you, it's better to have a detailed analysis
• 13. What is the physical pressure formula
• 14. There are several pressure formulas in physics How many physical formulas about pressure are there?
• 15. Science, physics and Computing A lamp is connected to the lighting circuit and the current is 68 ma Ask for: 1. What is the power of the lamp? 2. Power on for 3 hours a day, 30 days a month, how much power?
• 16. What do f = SP, s and P stand for in science
• 17. Work formula P = w / t time formula w = P * t power formula t = w / P
• 18. Calculation of physical pressure When the cubes A and B made of the same material are placed on the horizontal plane, the pressure of a and B on the desktop is P1 and P2 respectively. When a is placed on top of B, the pressure of B on the desktop is: [cube A is bigger than cube B, and its surface area is a little larger than cube b]
• 19. In pressure calculation, P = f / s, f means pressure. How to calculate pressure?
• 20. What is n in physical P = (FS) △ t = FV = nfv?