Teaching objectives of the teaching plan of one-dimensional equation in Jiangsu Education Press;
1, so that students can further understand the numbers expressed by letters and their functions, correctly express the relationship between quantities and their calculation formulas with formulas containing letters, and cultivate students' abstract generalization ability.
2. Make students deepen their understanding of equations and related concepts, master the steps and methods of solving simple equations, and correctly solve simple equations.
Emphasis and difficulty in teaching: understand and master the solution of simple equations by applying the properties of equations.
Teaching process:
First, reveal the topic.
On the basis of reviewing the concepts, calculations and application problems of integers and decimals, we are going to review and solve simple equations today. (Title on the blackboard) Through review, we can further understand that letters can represent quantities, quantitative relations and calculation formulas, deepen our understanding of the concept of equations, master the steps and methods of solving simple equations, and correctly solve simple equations.
Second, review the numbers with letters.
1, expressed by a formula containing letters:
(1) Find the quantitative relation of distance.
(2) Multiplicative commutative law.
(3) The area calculation formula of rectangle.
Ask the students to write the alphabet formula and name a person to perform. Name the students and say the meaning of each formula. Question: What is the function of using letters to represent numbers? How to write multiplication formula in letters?
2. do it. Practice? Question 1.
Let the students do it in the textbook. Answer the result by name, and the teacher writes it on the blackboard. How to find the value of the formula by combining the questions?
3. Do exercises 14, questions 1.
Name the students and answer them. Choose two and tell me what you think.
Third, review solving simple equations
1, review the concept of equation.
Q: What is an equation? Can you give an example of an equation? (The teacher writes down an example of the equation on the blackboard) What letters are there in the equation here? It is pointed out that letters can also represent unknowns in equations. Equations with unknowns are called equations. (Definition of blackboard writing)
2. do it. Practice? Question 2.
Show it on the blackboard. Students judge and explain the reasons. Question: What is the unknown X in 5x-4x=2? What is this equation? 7? 0.3+x=2.5 What is the unknown x? What is x=0.4 in this equation? What is that? The solution of the equation (blackboard definition) is related to it? Solve the equation? What is the difference? (Emphasize that solving the equation is a step-by-step process) Can you solve the equation and find the solution of the equation? According to what solution equation?
3. Solve simple equations.
( 1) Do？ Practice? Question 3, group 1.
Name two people performing on the blackboard and the rest of the students performing in the exercise books. Collective correction: what is the idea of solving the first equation and what is the basis of each step of solving the equation. What's the difference between the second equation and the first equation? What's the difference when solving equations? It is pointed out that when solving the equation, we must first see the problem clearly. According to the operation order, what can be calculated first is calculated first. If you can't calculate, consider it an unknown number. Now we usually solve equations according to the relationship between addition, subtraction, multiplication and division. (Combined with blackboard writing: solving equations: what can be calculated first, and then solved according to the relationship between the parts) Follow-up: How do these two questions test the solution of equations?
(2) do it? Practice? Two groups of questions after the third question.
Name two people performing on the blackboard, and the rest of the students are divided into two groups to do a set of questions respectively. Revise collectively, let the students talk about the difference between each group of two questions and the process of solving the equation. It is emphasized that the problem must be seen clearly first, and the first calculation can be made according to the operation order, and then the solution of the equation can be obtained according to the relationship between the four operations.
(3) do it? Practice? Question 4.
Ask the students to list the equations. Answer the equation by name, and the teacher writes it on the blackboard. What is the equivalent relationship between the equations of a sequence of numbers?
Fourth, class summary.
What did you review today? What did you clarify further?
Verb (abbreviation for verb) assigns homework.
Classroom assignments; Is it finished? Practice? Question 4: Solve the equation; Exercise 14, question 2, question 3, after question 4.
Homework; Exercise 14, question 3, first three questions, question 5.
Su teaches printing plate one-dimensional equation synchronous exercise. Do the math.
2a+a = x-0.4x = 1.5b+b = 5d-2d = 3.6？ 0.4= 2.5? 4= 17.8-7.8= 6.6+3.4=
Second, fill it out carefully.
1. If apples are a yuan per kilogram and Sydney is b yuan per kilogram, then
①4a stands for ()
②2b means ()
③a-b stands for ()
④5(a+b) means ()
2. The area formula of parallelogram expressed by letters is S= ().
When a=2.8cm and h= 1.5cm, S=( )cm2.
Third, choose a choice with your heart.
The solution of the equation 1. 10x = 5 is ().
A.x=5 B.x=0.5 C.x=0.05
2. In the following groups, the results of the two formulas are equal to ()
Points 42 and 4? 4 B.0. 12 and 0. 1? 2 C.52 and 5+5
3. The two numbers adjacent to A are ().
A.9、 1 1 B.a- 1、a+ 1 C.a、a+ 1
4. A rectangle, 20 meters long and b meters wide, with a circumference of ().
A.20+2b B.40+b
Fourth, solve the equation.
12(x+3.7)= 144 5x-3？ 1 1=42
Fifth, solving equations.