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Mathematics People's Education Edition Volume I Exercise Book 120 Page 120 Question 1;
Solution:
(1) is a top view from directly above.
(2) It is a front view from the front.
(3) is a side view from the side.
12 1 page
Question 2:
The first cylinder (4)
The second conical joint (6)
The third prism (3)
Page 122
The first question:
Solution: (1) All surfaces of (2) and the bottom surfaces of (3) and (5) are flat.
All the faces of the figure (4), the side faces of the figure (3) and the semicircle of the figure (5) are curved.
the second question
[A, B, C, D, E are used to represent the upper morphology, and 1-2-3-4-5 is used to represent the lower morphology]
A - 4 B - 3 C - 5 D - 1 E - 2
This is a simple question.
People's Education Edition, the first volume of the first day of mathematics, Chapter 1 Rational Numbers
1 positive number, negative number, rational number, inverse number, scientific notation, divisor
Number axis: The number axis is used to represent numbers.
3 absolute value: the absolute value of a positive number is itself; The absolute value of a negative number is its reciprocal; The absolute value of zero is zero.
Comparison of positive and negative numbers: positive numbers are greater than zero, zero is greater than negative numbers, positive numbers are greater than negative numbers, and negative numbers with large absolute values are smaller.
5 rational number addition rule:
Add two numbers with the same sign, take the same sign, and add the absolute values;
Adding different symbols with different absolute values of two numbers, taking the symbol of the addend with larger absolute value, and subtracting the absolute value with larger absolute value;
Two opposite numbers add up to zero;
Add zero to a number and you still get the number.
6 subtraction of rational numbers (converting subtraction into addition)
Subtracting a number is equal to adding the reciprocal of this number.
7 rational number multiplication rule
Multiply two numbers, the same sign is positive, the different sign is negative, and then multiply by the absolute value;
Any number multiplied by zero equals zero.
Two numbers whose product is 1 are reciprocal.
Division of rational numbers (conversion to multiplication)
Dividing by a non-zero number is equal to multiplying the reciprocal of this number.
The 9th power of rational number.
Any positive power is positive;
Any power of zero is negative;
The odd power of a negative number is negative and the even power of a negative number is positive.
10 mixed operation sequence
(1) Multiply first, then multiply and divide, and finally add and subtract;
(2) the same layer operation, from left to right;
(3) If there are brackets, do the operation in brackets first, and then follow the brackets, brackets and braces.
Chapter II Addition and subtraction of algebraic expressions
1 algebraic expression: the general term for monomials and polynomials;
Addition and subtraction of algebraic expressions
(1) Merge similar projects.
(2) Dismantle the bracket
Chapter III One-variable Linear Equation
Understanding of 1 linear equation
2 the nature of the equation
Add or subtract the same number or formula on both sides of the equation, and the results are still equal;
Multiplied by the same number on both sides of the equation, or divided by the same non-zero number, the result is still equal.
3. Solve a linear equation with one variable
General steps: denominator, brackets, terms, similar terms, coefficients.
The fourth chapter is the preliminary understanding of graphics.
1 geometry: plane and solid.
2 points, lines, surfaces and bodies
3 lines, rays and segments
Two points determine a straight line;
Between two points, the line segment is the shortest
4 jiao
Degree of measurement of angle
Comparison and operation of angles
Complementary angle and complementary angle: the complementary angle of an equal angle is equal to the complementary angle.
Day 1 and Volume 2
Chapter V Intersecting Lines and Parallel Lines
The intersection of 1: the vertex angles are equal.
2 vertical lines
Through a point, there is only one straight line perpendicular to the known straight line;
Of all the line segments connecting points outside the straight line and points on the straight line, the vertical line segment is the shortest (the shortest vertical line segment).
Three parallel lines
Parallelism axiom: after passing a point outside the straight line, there is one and only one straight line parallel to the known straight line;
If both straight lines are parallel to the third straight line, then the two straight lines are also parallel to each other;
Judgment: the same angle is equal and the two straight lines are parallel;
Internal dislocation angles are equal and two straight lines are parallel;
The internal angles on the same side are complementary and the two straight lines are parallel.
Properties: Two straight lines are parallel, with equal included angles, equal internal angles and complementary internal angles.
4 proposition: a sentence that judges one thing.
5 translation
Chapter VI Plane Cartesian Coordinate System
1 Ordered number pair: (a, b)
2 plane rectangular coordinate system, origin, horizontal axis, vertical axis and quadrant
3 simple application: use coordinates to represent position; Coordinate translation.
Chapter VII Triangle
1 Edge is related to triangle:
Edge, height, midline, angle bisector and stability of triangle
The angle associated with a triangle.
Internal angle: the sum of the internal angles of the triangle is 180 degrees.
External angle: one external angle of a triangle is equal to the sum of two internal angles that are not adjacent to it;
The outer angle of a triangle is greater than any inner angle that is not adjacent to it.
2 polygons
Internal angle: the sum of the internal angles of the polygon is (n-2) *180;
External Angle: The sum of the external angles of a polygon is 360 degrees.
Chapter VIII Binary Linear Equations
Introduction of 1 binary linear equation and binary linear equations
2 binary linear equations solution
Substitution elimination method (addition and subtraction)
3 practical application of binary linear equations
Chapter 9 Inequality and Unequal Groups
1 inequality and its solution set: formula with unequal relation sign;
2 the essence of inequality
Add and subtract the same number or formula on both sides of the inequality with the property 1, and the direction of the inequality remains unchanged;
Property 2 Both sides of inequality are multiplied or divided by the same positive number, and the direction of inequality remains unchanged;
Property 3 Both sides of inequality are multiplied or divided by the same negative number, and the direction of inequality changes.
3 the application of one-dimensional linear inequality in practical problems
4 One-dimensional linear inequalities and their solutions: maximization; Small and small; The big and the small walk on both sides, and the big and the small walk in the middle.
Chapter 10 Real Numbers
1 square root: a positive number has two square roots, which is reciprocal;
The square root of zero is zero;
Negative numbers have no square root;
The arithmetic square root of a positive number is a positive number;
The arithmetic square root of zero is zero.
2 cube root: the cube root of a positive number is a positive number;
The cube root of a negative number is a negative number;
The cube root of zero is zero.
Real number: the collective name of rational number and irrational number. Irrational number is an infinite cycle decimal.
If you want to find the overall answer, you may wish to go to Xunlei or Baidu "People's Education Edition, Download the First Mathematical Answer".
The ninth question (step) (60- 15) * 0.002 = 0.09 (mm-, (5-60) * 0.002 =-0.11.
0.09-0. 1 1 =-0.22 mm
Answer: First, the length was increased by 0.09mm, and then it was shortened by 0. 1 1mm, which was -0.02mm longer than the original.
Get more points.
Mathematics People's Education Edition of Grade One has published a good exercise book "Complete Interpretation", which mainly talks about the comprehensive types of exercises:
Zero error
The answer alarm clock on page 4 1 and page 42 of the first volume of the Mathematics People's Education Edition of the first grade is within 20 seconds after a day and night.
The first volume of the Mathematics People's Education Edition for Junior One has 72 pages and 73 pages. The answer is 3.14.46 5.46.1000 7.48.5.
Lian No.4
2.( 1) 16 (2)2% (3)70. 100.200.(4) 104(5) 15 (6)42 3。
The good question of the Senior One Mathematics People's Education Edition is 1. A batch of parts will be completed by the master in 5 hours and the apprentice in 7 hours. When the two cooperated, the master made more than half of 18. How many parts are there in this batch?
2. Team A 10, Team B 12 and Team C 15 completed an expressway. Now the three teams are working together to repair it, but in the middle, Team A withdrew to another construction site, and it took six days to complete the expressway. Q: How many days did B and C work after Team A quit?
Question 1: When the mentoring ends, the time taken is1(1/5+1/7) = 35/12 (hours).
The master does more than the apprentice: 18*2=36 (this is 35/ 12 hours).
Do more per hour: 36/(35/ 12)=432/35 (pieces)
The total number of those who do more: 1/5- 1/7=2/35.
The total number is: (432/35)/(2/35)=2 16 (pieces).
Question 2: Using Equation
Solution: A worked for X days.
x/ 10+ 1/ 12 * 6+ 1/ 15 * 6 = 1
The solution is x= 1.
On the day A went to work, B and C were also working, but in fact B and C worked for six days, so after A left, B and C worked again: 6- 1=5 (days).
Hehe o(∩_∩)o ... Come on!
How to do the ninth question on page 85 of Senior One Mathematics Education Edition, Brother Ji, I am also a Senior One student. The teacher talked about this problem. I tell you, if the radius of the inner circle is xcm, then the square of 10x 10x Pai-Pa is equal to the square of =200cm.