x-y=2
①+②:2x=6
x=3
X=3 becomes ①: 3+Y = 4.
y= 1
(2) x+2y=32 ①
x-y=8 ②
From ①, x=32-2y ③.
Substitute ③ into ② 32-2y-y=8.
32-3y=8
3y=24
y=8
Y=8 instead of ③: X = 32-2× 8 = 16.
(3)2x+2y= 1①
6x-6y= 1②
② It can be simplified as 2x-2y= 1/3③.
①+③ :4x=4/3，
x= 1/3
Substitute x= 1/3 into ③, and y= 1/6.
(4)x+2y=5①
3x+y= 10②
Substitute ①: x = 5-2y into ②: 3 (5-2y)+y = 10.
15-6y+y= 10
y= 1
Y= 1 substitute ①: X = 5-2Y = 3.
(5)5x-y=2①
4x-y=7②
②-①:-x=5
x=-5
X=-5 is substituted into ①: 5× (-5)-Y = 2.
y=-27
(6)2x-y=3 ①
3x+2y=8 ②
①×2+②:7x= 14
x=2
Substitute x=2 into ①: Y = 2× 2-3.
y= 1
(7) 2x-y=5 ①
3x+4y=2 ②
①×4+②: 1 1x=22
x=2
X=2 becomes ①: 2x2-y = 5.
y=- 1
(8)2x-3y=7 ①
x-3y=7 ②
①-②:x=0
X=0 becomes ②-3y=7.
y=-3/7
(9)2x+y=5 ①
x-3y=6 ②
①-②×2:7y=-7
y=- 1
Y=- 1 substitution ②: X-3× (- 1) = 6.
x=3
( 10) x+3y=7 ①
y-x= 1 ②
①+②:4y=8
y=2
Y=2 becomes ②: 2-X = 1.
x= 1
What is the math content of the second volume of the first day of junior high school? Chapter V Intersecting Lines and Parallel Lines
5. 1 intersection line
5. 1.2 vertical line
5. 1.3 Conformal angle, internal dislocation angle and ipsilateral internal angle.
Observe and speculate
5.2 Parallel lines and their determination
0+0 parallel line
5.3 Properties of parallel lines
Properties of parallel lines
Propositions and theorems
5.4 Translation
teaching activities
summary
Chapter VI Plane Cartesian Coordinate System
6. 1 plane rectangular coordinate system
6.2 Simple application of coordinate method
Reading and thinking
6.2 Simple application of coordinate method
teaching activities
summary
Chapter VII Triangle
7. 1 Line segment related to triangle
7. 1.2 The bisector of the height, midline and angle of a triangle.
7. Stability of1.3 Triangle
Information technology application
7.2 Angle related to triangle
7.2.2 External Angle of Triangle
Reading and thinking
7.3 Multiple deformations and sum of their internal angles
Reading and thinking
7.4 Project Learning Mosaic
teaching activities
summary
Chapter VIII Binary Linear Equations
8. 1 binary linear equations
8.2 Elimination Solution of Binary Linear Equation
8.3 Practical Problems and Binary Linear Equations
Reading and thinking
*8.4 examples of solving ternary linear equations
teaching activities
summary
Chapter 9 Inequality and Unequal Groups
9. 1 inequality
Reading and thinking
9.2 Practical Problems and One-dimensional Linear Inequalities
Experiment and inquiry
9.3 One-dimensional linear inequality system
Reading and thinking
teaching activities
summary
Chapter 10 Data Collection, Arrangement and Description
10. 1 statistical survey
Experiment and inquiry
10.2 histogram
10.3 project learning talking about water saving from data
teaching activities
There is no problem how to calculate the mathematical real number in the second volume of the first day of junior high school. I'll just write one.
6√3+5√3×√3
=6√3+5×√3×√3
=6√3+5×3
=6√3+ 15
The second volume of the fifth grade contains decimal mathematics. What are the observation objects of the decimal calculation problem (3) (simple)
Multiplication factor
Cuboid, cube *. (Special Unit) Explore Graphics
The nature of the score (including average score, approximate score ... too lazy to play, tired)
The movement of graphics (3) (this is very simple)
Addition and subtraction of fractions. (General score and approximate score are required) * (Special unit) Make a phone call (this is a bit difficult)
Broken line statistical chart (simple and clear)
Mathematics wide angle-find defective products (be careful about this)
General comments
Asking for adoption ~ Typing is hard and tiring. For this reason, adopt it.
What is the math content of the second volume of the first day of junior high school? Chapter One: Algebraic Expressions
Chapter 2-Chapter 4: On the formula of multiplication and division power and complete square.
Chapter 5: Intersecting Lines and Parallel Lines
Chapter 6: Plane Cartesian Coordinate System
Chapter 7: Triangle
Chapter 8: Binary Linear Equation
Chapter 9: Inequality and Unequal Groups
Chapter 10: data collection, collation and description
Thirty calculation problems in the second volume of the second day of junior high school. 65 + 60
34 * 19
65 - 43
57 - 35
67 + 22
97 - 1
5 1 / 6
36 * 8
63 * 56
9 1 * 1
83 / 2
4 + 3
45 - 12
19 / 17
2 1 + 3
49 - 37
78 * 7
57 / 1
49 + 48
96 + 83
8 * 7
43 - 9
2 - 1
72 - 23
48 + 24
85 * 84
37 + 13
43 + 26
22 + 2 1
2 + 2
The first day of the second book 450 calculation problems! Son, do you have it in your textbook exercises and counseling materials? = = grab 450 casually and copy it down.
What is your version of the math content in the second volume of the second day of junior high school?
Give 20 first-grade calculation questions. 1. Fill in the blanks: (2 points for each question, ***40 points)
1. The rational number whose square is 25 is, and the number whose absolute value is equal to 3 is.
2. There are five points on the number axis, five units away from the point. They are.
3. If and are opposites, then.
4. All integers greater than and less than are.
5., 。
The reciprocal of a number is the largest negative integer, so this number is.
6. If and are opposites, then.
7. If, then.
8. Multiply several numbers that are not equal to zero. If the product is negative, there will be a negative factor.
9. Use ""to connect the following numbers:,,, 0 Yes.
10. If, then.
1 1. As we all know, the value of is.
12. Xiaoming took the elevator from the second floor underground to the eighth floor above ground, and the elevator went up to the first floor.
13. Observe the following data and fill in the appropriate figures on the horizontal line according to certain rules.
, , , , ,( ),( )。
14. If, and are reciprocal, then.
15. The cubic number is.
Second, multiple-choice questions (4 points for each question, ***20 points)
16. The sum of all integers with absolute values greater than 2 and less than 5 is ().
A.B. 5 C. 7 D. 0
17. The following statement is true ()
A. The smallest integer is 0 b. The absolute values of two opposite numbers are equal.
C. If the absolute values of two numbers are equal, then the two numbers are equal. D. rational numbers are divided into positive numbers and negative numbers.
18. The school, home and bookstore are located in a north-south street in turn, with the school home 20 south and the bookstore home north 100. Zhang Ming starts from home, goes north for 50, and then goes north for -70. At this time, Zhang Ming's position is
( )
A. At home B. School C. Bookstore D. Where it's not above.
19.,, Then, the size relationship of, is ()
A.B. C. D。
20. On a certain day, the opening price of stock A was 12 yuan, and it fell1:36 in the morning 1.0 yuan in the afternoon, so the closing price of stock A was ().
A.0.2 yuan B. 9.8 yuan C. 1 1.2 yuan D. 12 yuan.
Three, calculate the following questions (4 points per question, ***32 points)
2 1.
22.
23.
24.
25.
26.
27.
28.
Four, answer questions (7 points per question, ***28 points)
29. Find the value of algebraic expression.
30. Fill in the nine numbers -8, -6, -4, -2, 0, 2, 4, 6 and 8 in the figure below, so that the three numbers in each row, column, column and diagonal add up to 0.
3 1. Known reciprocal, and reciprocal, the absolute value is equal to 5, try to find.
The value.
32. If rational number, satisfaction,
Try to find the value of.
Download the math problem in Unit 1, Book 2, Grade 1, and do more calculations. Thank you. 1. The following groups of numbers can be used as three sides of a right triangle ().
A. 12， 15，20； B. 6，8， 10； C. 7、8、9； d . 1 1.35，37
2. The following statement is wrong (CD)
The square root of A. 9 is 3; The cube root of b- 1 is-1;
C. is the square root of 2; D.–2 is the square root.
3. If the specified error is less than 1, the estimated value of is ().
A.7; B. 7.07C. 7 or 8; D. 7 and 8.
As the picture shows, * * * has five triangles. From the position, () is the 1 th triangle on the left.
The shape is obtained by rotating 2700 clockwise around its right-angled vertex.
5. Every outer angle of a polygon is equal to 300, and this polygon is ().
A. hexagon; B. regular octagon; C. ten sides. 23. Xiaoming's door is ready Now it is necessary to test whether the door is rectangular. What do you do?
Does Fa help him? Tell me about it. (Numbers are required; positive twelve edge shape
6. In Δ Δ ABC, ∠C=900, if BC=5, AC= 12, then AB=.
7. Fill in the following figures in the corresponding set:
19, -0.302, , 160, 0, , , , - .
① Rational number set: {…};
② irrational number set: {…};
③ Positive real number set: {…};
④ Real number set: {…}.
Volume 2 (non-multiple choice questions)
2. Fill in the blanks (this big topic is ***7 small questions, each small question is 3 points ***2 1 point, and the score is directly filled in)
The reciprocal of 8 is, the reciprocal is, and the absolute value is.
9. Comparison size: 2.35. (fill in ">" or "
10. The combination of regular polygons that can densely lay the ground is.
1 1. As shown in the figure, a regular triangle is the midpoint around one side clockwise.
The pointer rotates 600 times, so that the figure is formed after three consecutive rotations.
There is a parallelogram in the box.
12. The sum of the internal angles of a heptagon is one degree.
3. Answer the question (5 small questions in this big question, 5 points for each small question, 25 points for * * *).
13. Simplify:
① ; ②
14. When climbing a building with a height of 8m, for safety reasons, the bottom of the ladder should be 6m away from the building.
How long is this ladder at least?
15. Make corresponding points on the number axis.
16. Draw the figure of ABC rotating around its outer point o 1800, and write out the drawing steps.
Four. (This big question has ***4 small questions, each with 6 points and * * * 24 points.)
18. As shown in the figure, in the square ABCD, AC= 10, E is any point of AB, and find the point from E to AC.
The sum of distances of BD.
17. As shown in the figure, the side AB of the rhombic ABCD is 5 cm, and the diagonal AC is 8 cm. Find another diagonal line.
Straight line length BD.
19. The relationship between the height (m) of free fall and the falling time (s) is. there is a
The steel ball falls freely from a building with a height of 44. 1 m. How long does it take to reach the ground?
20. As shown in the figure, trapezoidal ABCD, AD ‖ BC, ∠ B+∠ C = 900, AD = 1, AB = 3, CD = 4.
Find the length of BC through translation.
2 1. Analyze the rotation phenomenon in the figure below.
23. Xiaoming's door is finished. Now it is necessary to test whether the door is rectangular. What do you do?
Does Fa help him? Tell me about it. It needs a combination of graphics and shapes to show that the graphics should be drawn correctly and the lines should be clear.
A clear and definite explanation. ) V. (This big question is ***2 small questions, 22 questions are 7 points, 23 questions are 8 points, *** 15 points)
22. As shown in the figure, can it be used to verify the Pythagorean theorem?