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"General Review - Formulas and Equations" PPT courseware
teaching objectives
1. Deepen your understanding of the meaning and function of using letters to express numbers, and be able to use letters to express numbers and common quantitative relationships.
2. Able to find the value of the formula containing letters based on the values of the letters.
3. Deepen your understanding of the meaning of equations and be able to solve simple equations.
concept search
Groups of four communicate with each other:
1. What is an equation? Please give an example.
2. What are the connections and differences between equations and equations?
3. What properties do you know about equations? Please give an example.
1. Fill in the blanks.
1. Xiaohong is m years old this year, and Teacher Chen is 3 times younger than her by 8 years. Teacher Chen’s age is ( ) years. If m=12, Teacher Chen is ( ) years old this year.
2. Build a road a kilometer long, if you build 2 kilometers every day. After repairing b days, there are ( ) kilometers left.
3. Three consecutive natural numbers, the largest one is a, then the smallest number is ( ).
2. Choice.
1. Xiao Tao read a book and read 20% of the whole book on the first day. The whole book has x pages. There are ( ) pages left.
A. 20% x B. x -20% C. x - 20%x
2. Xiaogang is a year old this year, and Xiaohong is (a+5) years old this year. After x years, their age difference will be ( ) years.
A, 5 B, x C, x +5
1. Thinking: What kind of word problems do you think need to be solved using equations?
1. When the unit "1" is unknown, it is easier to solve it with an equation.
Type 1: word problems of sum times and differences. The unit "1" is unknown and solved using equations.
Type 2: How many times more (less) than whose number? The unit "1" is unknown and solved using equations.
Type 3: Number A is more (less) than number B by a few fractions or percentages. When the unit "1" and the number B are unknown, use the equation to solve it.
2. When encountering problems or distance problems during the journey, when finding the meeting time or the speed of a car, use equations.
3. The quantitative relationship in the question is relatively complex. When the unit "1" is inconsistent, first convert the invariant into the unit "1", then establish a relationship between the variable and the unit "1", and then think about using equations to solve it.
…
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