The reciprocal of 1 -(-) is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. 2. If |x|+|y|=0, then x = _ _ _ _ _ _ _ _ _ and y = _ _ _ _ _ _ _. 3. If |a|=|b|, then A and B _ _ _ _ _ _ _ _ _ 4. Because the number of points with equal distance from point 2 to point 6 is 4, there is such a relationship, then the number with equal distance from point 100 to point 999 is _ _ _ _ _ _ _ _ _ _ _ _; The number represented by a point with the same distance from the point is _ _ _ _ _ _ _ _ _; The number represented by points with equal distance from m to -n is _ _ _ _ _ _ _ _. 5. Calculation: = _ _ _ _ _ _. 6. Known, then = _ _ _ _ _ _. 7. If = 2, then x = .8. The rational number represented by a point 4 units away from point 3 is _ _ _ _ _ _ _ _. 9. The rational number within the range of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 10. A positive integer less than 3 is _ _ _.11. If m 0, | m | > | n|, then m+n _ _ _ _ _ _ 0. Reference answers for rational number exercises: fill in the blanks 1.4,-,. Tip: Although the questions are simple, such conceptual questions are almost compulsory in the seventh grade exam. 2.0,0. Hint: | x | ≥ 0, | y | ≥ 0. ∴ x = 0，y = 0.3。 Equal or opposite numbers. Tip: The absolute values of mutually opposite numbers are equal. 4.549.5. Tip: The midpoint of a number with two equal points on the number axis is equal to half of the sum of these two numbers. 5.0. Tip: The sum of two adjacent items is 0. 6.-8. Hint: 4+a=0, a-2b=0, and the solution is: a =-4, b =-2. =-8.7.x-3 = 2。 X = 3 2, X = 5 or X = 1.8. -1 or 7. Tip: The rational number represented by point 3, which is 4 units away, is 3 4. 9.3.1415-3.1424. Tip: According to the rounding rule. 10. 1, 2. Tip: An integer greater than zero is called a positive integer. 1 1.& lt0. Hint: the sign of rational number addition depends on the number with large absolute value. References:

/question/ 1758 1670 . html？ Fr=qrl3 II。 Fill in the blanks: (3 points for each small question, ***24 points) 1 1. If the solution of equation -x- a=-3 is -4, then A = _ _ _ _ _ _ _ 12. as shown in fig. 5, it will be the 13 face whose reverse side is _ _ _ _ _. I have read three math books in a row, and the sum of the page numbers is 453, so the page numbers of these three pages are the first _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. The number of trapezoids is _ _ _ _ _ _ _. 15. The approximate number is 3. 1× 105, accurate to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. The results of boys in this class are as follows: 2-1 0 3 -2 -3 1 4. Then the success rate of boys in this class is about _ _ _ _ _ _ _18. A shop raised the original price of a microwave oven by 40% and then sold it at a 20% discount. As a result, every microwave oven was sold. The original price of this oven is _ _ _ _ _ _ _ yuan. Answer: 2. Fill in the blanks 1 1. a = 14 12.6 13. 150， 1565438。