2、(x^3-2x^y)÷(-x^2)
3、-2 1a^2b^3÷7a^2b
4、(6a^3b-9a^c)÷3a^2
5、(5ax^2+ 15x)÷5x
6 、( a+2b)(a-2b)
7、(3a+b)^2
8 、( 1/2 a- 1/3 b)^2
9 、( x+5y)(x-7y)
10 、( 2a+3b)(2a+3b)
1 1 、( x+5)(x-7)
12、5x^3×8x^2
13、-3x×(2x^2-x+4)
14、 1 1x^ 12×(- 12x^ 1 1)
15 、( x+5)(x+6)
16 、( 2x+ 1)(2x+3)
17、3x^3y×(2x^2y-3xy)
18、2x×(3x^2-xy+y^2)
19、(a^3)^3÷(a^4)^2
20、(x^2y)^5÷(x^2y)^3
2 1、(y^3)^3÷y^3÷(-y^2)^2
22、(-2mn^3)^3
23 、( 2x- 1)(3x+2)
24 years old (2/3 x+3/4 y) 2
25、200 1^2-2002×2002
26、(2x+5)^2-(2x-5)^2
27、- 12m^3n^3÷4m^2n^3
28、2x^2y^2-4y^3z
29、 1-4x^2
30、x^3-25x
3 1、x^3+4x^2+4x
32 、( x+2)(x+6)
33、2a×3a^2
34、(-2mn^2)^3
35 、(-m+n)(m-n)
36、27x^8÷3x^4
37. (-2x 2) × (-y)+3xy× (1-1/3X)
38、am-an+ap
39、25x^2+20xy+4y^2
40、(-4m^4+20m^3n-m^2n^2)÷(-4m^2)
4 1、( 12p^3q^4+20p^3q^2r-6p^4q^3)÷(-2pq)^2
42 、[ 4y(2x-y)-2x(2x-y)]⊙(2x-y)
43、(x^2y^3- 1/2 x^3y^2+2x^2y^2)÷ 1/2 xy^2
44、(4a^3b^3-6a^2b^3c-2ab^5)÷(-2ab^2)
45 、( ax+bx)÷x
46 、( ma+mb+mc)÷m
47、(9x^4- 15x^2+6x)÷3x
48、(28a^3b^2c+a^2b^3- 14a^2b^2)÷(-7a^2b)
49、(6xy^2)^2÷3xy
50、24a^3b^2÷3ab^2
Beijing Normal University Edition Eighth Grade Mathematics Volume I Beijing Normal University Edition Eighth Grade Mathematics Teaching Plans and Exercises Volume I: (Including Textbook Answers)
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The first volume of the eighth grade mathematics teaching article published by Beijing Normal University (not very useful);
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Urgently ask for the first volume of the eighth grade mathematics handout of Beijing Normal University Edition: JY5 1. /teacher /list 10. ASP？ cid = 10 & amp； id= 16964
Name of Teaching Plan: Mathematics Book IX Teaching Plan (Beijing Normal University Edition)
Teaching plan size: 542KB
Website resources are all free!
You can download it after logging in!
Teaching plan evaluation:
Application grade: Grade 5
Applicable course: Mathematics
Author: Mr. Zhong
Work unit: Futian Central Primary School, Boluo County, Guangdong Province
Email: unknown
Completion time: 2004-11-921:49: 00.
Number of downloads: 35 1
Introduction to teaching plan:
Primary school mathematics volume 9 teaching plan
Download address: Click Download > Mathematics Volume IX Book Teaching Plan (Beijing Normal University Edition)
Eighth grade math video of Beijing Normal University: People's Education Edition ../CE/CZYY/JCPX/BJTJ/20060614 _ 256546.htm.
Beijing normal university printing plate eighth grade first volume mathematics answer 7. ( 1) V = 5t+ 10 (2) 60m3
8. It takes different time to walk the same distance at different speeds.
9. Omit
10. uniforms
1 1 . y = 1.8x+32(2)y = 1.8x+32
12. (1) L2 (2)10m (3) Xiaoming
13.( 1) Two stores saved money (2)30 copies.
14.( 1) draft
(2) These points are approximately on a straight line.
(3)t=25-6.5h
④ About 2.3 degrees.
15. Weigh the quality of coins, and then weigh the total quality of cans and coins.
16. Sketch (1) These images all pass through the (0, 1) point, and Y increases with the increase of x value, but the inclination of these images is different. (2) It affects the tilt of the image.
It has been changed!
Page 135 of the first volume of the eighth grade of Beijing Normal University Edition, the second question A: The quadrilateral ABCD is a square.
Reason: OA = OB = OC = OD.
∴ The quadrilateral ABCD is a diamond.
∫OA+OC = o b+ OD
Namely AC=BD
∴ quadrilateral ABCD is a square
As our teacher said, it should be right.
The key to understand the meaning of the question 14 on page 96 of the first volume of eighth grade mathematics of Beijing Normal University Press is to connect with practical problems.
In practice, it is not easy to directly measure the distance between two points AB, because there is a mountain between these two points.
Therefore, it is necessary to "translate" the line segment AB to the flat ground that can be directly measured by the measuring instrument. This is the knowledge of translation.
Specific operation:
Length:
The first task is to connect the line segment "AB" on the map, then translate this line segment to a flat land (this can be seen on the map), and then determine the actual latitude and longitude coordinates (or other coordinates, which are surveying knowledge, you can just write coordinates) corresponding to the two endpoints on the flat land. Then the work is to ask the surveyors to measure the length of this line segment, that is, the length of AB.
Direction:
Because it is "translation", the condition is that the line segment AB does not rotate. So the direction of another equivalent line segment is the direction of AB.
The meaning of "direction" here is actually a measurement definition, such as the angle between line segment AB and true north direction. With the angle, the excavation direction in actual tunnel engineering can be determined.
The first volume of eighth grade mathematics, Beijing Normal University Edition 1 1, page 2, Question 1/2 times the square of bracket A plus B equals the square of half C plus 2 times half AB.
I'm also a sophomore and an eighth grader at Beijing Normal University. The first volume of mathematics is p 174, page 13.
Solution: pass b as BE⊥AD and pass c as CF⊥AD (drawing by yourself)
Then be = 6 and AE = 3.
CF=8，DF= 16- 14=2
EF= 16-3-2= 1 1
∴S triangle Abe = 3× 6 ÷ 2 = 9
∴S triangle CDF = 2× 8 ÷ 2 = 8
∴S trapezoidal BEFC = (6+8) ×11÷ 2 = 77
The area of this quadrilateral = 9+8+77 = 94.
I hope I can help you. Take it.
Mathematics Knowledge Tree (Beijing Normal University Edition), the first volume of the eighth grade: linear function, can obtain information through function images, develop image thinking, understand and determine two conditions of a linear function, solve some simple linear function expressions from two conditions, solve related problems, skillfully make images of linear functions, understand the relationship between equations and images, and clarify the expressions of linear functions and proportional functions. Difficulties: real numbers, knowing the concepts of arithmetic square roots and square roots of numbers, will use the root sign to represent the arithmetic square roots and square roots of a number, and understand that square roots and square roots are reciprocal. We will use this reciprocal operation relationship to find some non-negative arithmetic square roots and square roots, and pay attention to the differences and connections between square roots and arithmetic square roots. The difference is that positive numbers have two square roots, while arithmetic square roots have only one. The connection is that the positive square root of a positive number is its arithmetic square root and the negative square root is the opposite of its arithmetic square root. So you can write its square root immediately according to its arithmetic square root, find the square root and cube root with a calculator, and understand the meaning of real numbers. Emphasis: the exploration of binary linear equations and quadrilateral properties. Binary linear equations: Understand binary linear equations, and judge whether a set of numbers is a solution of binary linear equations, solve binary linear equations by substitution elimination method and addition and subtraction elimination method, list the corresponding binary linear equations according to the meaning of the question, and solve and understand the relationship between binary linear equations and functions. A probe into quadrilateral properties: 1. Using the properties of parallelogram, we can find out the degree of angle and the length of line segment, and also prove that angle, line segment and bisector of line segment are equal. 2. Explore and master the discriminant conditions of parallelogram. To judge whether a quadrilateral is a rhombus, it is generally judged that the quadrilateral is a parallelogram first, and then a group of adjacent sides are equal or diagonal lines are perpendicular to each other. 3. Trapezoids and rectangles are also judged by definition. 4. After that, the sum of the inner and outer angles of the polygon will be judged. 4. You can draw a figure with a symmetrical center, which can be rotated or translated. That's all I can summarize. Others need your efforts!