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 _ _ _ _.
1 1. If m 0, | m | > | n|, then m+n _ _ _ _ _ _ 0.
12. The topic of the proposition "Equal is relative vertex angle" is (), and the conclusion is (). This proposition is ().
13. It is known that the lengths of four line segments are 2, 3, 4 and 5 respectively. Three line segments are selected as the three sides of a triangle, and the perimeters of triangles obtained by different combinations are () respectively.
14. In the plane rectangular coordinate system, point A is on the X axis, OA=4, AB is perpendicular to the X axis, and triangle AOB= 12, so the coordinate of point B is ().
15. The student asked the teacher, "How old are you this year?" The teacher said, "When I was your age, you were only 1 year old. I was 37 years old when you were my age. " So the teacher is () years old and the students are () years old.
1. Calculation:1998 *1991999-19998199865438 =
2. If you define a new operation &; , met a&; B=a*b-a/b, then (1&; 2)& amp； 4=
3. The reciprocal of-1/2000 is
4. Is there an integer whose absolute value is greater than 2 and less than 6?
5. Calculate the value of 103*97* 10009 as follows.
6. The reciprocal of the reciprocal of a rational number is 3 times 1/3, so this rational number is
7. Randomly draw two cards from five cards marked with 13468, and the probability that the sum is odd is
8. A school organizes junior three students to go for a spring outing. M teachers and students rented a number of 45-seat buses, and * * * had four empty seats. Then the number of buses rented is (expressed by the algebraic expression of m).
9. It takes half a minute for a train to cross a 400-meter-long bridge at the speed of one minute ago, so the length of the train itself is
10. There are two brothers. Now my brother's age is 1/2 of my brother's, while my brother's age was 1/5 nine years ago, so my brother's age now is, if the direction from A to B is northeast 19 degrees, then the direction from B to A is southwest _ _ _ _.
Given the line segment AB, extending the line segment AB to C makes BC= 1/2AB, and conversely extending AB to D makes AD=2/3AB, then the midpoint of the line segment CD is _ _ _ _ _ _.
(1) Three consecutive odd numbers, the middle of which is 2n+ 1, then the sum of these three consecutive odd numbers is ().
② When k= (), the polynomial (x? -3kxy-3y？ ) +2(xy-4) does not contain an xy term.
③ It is known that A-B = 2, B-C =-3, C-D = 5, and the value of (a-c)(b-d)÷(a-d) is ().
1) three rational numbers, the product of a, b and c is negative, and its sum is positive. When X=|a|/a+|b|/b+|c|/c, then x19-92x+2 = _ _ _ _ _.
2) 1/ 1 * 2+ 1/2 * 3+ 1/3 * 4+k 1/2006 * 2007 = _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .
3) If positive integers x and y satisfy 2004X= 15Y, then the inverse of X+Y is 1. -3 is _ _ _ _ _ _ _ _ _ _.
2. If and are similar projects, then _ _ _ _ _ _ _.
Of all the letters in this sentence. The frequency of the letter ""is _ _ _ _ _.
4. In the equation, _ _ _ _ _ _ if it is expressed by an algebraic expression.
5. Fill in the two squares of equation 3×-2× = 15, so that the two numbers are opposite and the equation is established. Then the number in the first box is _ _ _ _ _ _ _.
6. The degree of the known complementary angle is _ _ _ _ _.
7. Given that the line segment AB=2cm, extend AB to point C, so that BC=4cm, and D is the midpoint of AB, then the line segment DC = _ _ _ _ _ _
1 1. The owner of a store first raises the price of a commodity whose purchase price is 800 yuan, and then sells it at a 20% discount, so the profit from selling this commodity is RMB.
1. When the water level rises by 3m, the water level changes to +3m, so it means -5m.
The reciprocal of 2. 8 yes; The absolute value of is 1.
3. The point 3 units away from the origin on the number axis represents the number _ _ _ _ _ _ _ _.
4. On the surface of the moon, during the day, the temperature where the sun shines vertically is as high as+127℃; The temperature can be reduced to-183℃ at night. The temperature difference between day and night on the surface of the moon is _ _ _ _ _ _ _ _℃
5.302400, when expressed by scientific notation, should be _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
6. The cardinal number of is _ _ _ _ _ _, and the index is _ _ _ _ _.
7. The single factor is, and the number is.
8. Comparative scale:-(-1) _ _ _ _ _ _-∣-1∣.
9. Li Ming went to the stationery store to buy pencils and erasers for 30 students of the school art troupe. It is known that each pencil is m yuan and each eraser is n yuan. If you buy two pencils and three erasers for each student, you have to pay _ _ _ _ _ _ _ _ _.
10. There is a list of numbers arranged according to a certain rule: 2, -4, 8,-16, 32, -64, ... According to this rule, the number to write the first item is. (★ Friendly reminder: it can be expressed in the form of power and needs to be tested. )
11.5-3-4+1-7 is pronounced _ _ _ _ _ _ _
12. given a=5, B =-3, the last digit of a99+b 100 is _ _ _ _ _