The difference between positive and negative numbers
The biggest difference between positive and negative numbers is that there is a negative sign in front of negative numbers. If the boundary is zero, the right side of zero is a positive number and the left side is a negative number
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- 1. Knowledge points of addition and subtraction from positive and negative numbers to integral The finer the better
- 2. Math problem growth rate By the way, I feel dizzy. The question is like this In order to meet the needs of urban development, it is planned to make the urban green space area reach 71.3 hectares by the end of 2007. Try to find the growth rate of the green space area at the end of 2007 compared with that at the end of 2005 (the green space area was 62 hectares in 2005). I remember that I learned the growth rate, but I forgot to help
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- 5. On rational numbers and absolute values If Ia + 3I + ib-5i = 0, then a = (), B = () Who would,
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- 7. How many numbers can be taken from natural numbers 1 to 100 so that the sum of any four numbers can be divided by 15
- 8. The sum of all natural numbers within 100 divided by 5 and 1 is______ .
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- 10. 20 times of a number minus 1 can be divided by 153, the smallest of such natural numbers is______ .
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- 13. 4o4o4o4o4o4 = 0, add, subtract, multiply and divide in O. the symbol can be used repeatedly. Multiply and divide first, then add and subtract. Brackets cannot be used
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- 16. How can I get 24 by adding, subtracting, multiplying and dividing 3 5S and 1 1s
- 17. How to calculate that the result of 3, - 5, - 7 and (- 13) is 24?
- 18. Solving equations and practical problems The distance between the two places is 42 kilometers. Xiaoming starts from place a to place B by bike at a speed of 20 kilometers. 0.4 hours later, Xiaogang starts from place B by motorcycle. 0.5 hours later, they meet on the way,
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