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Authoritative PPT Summary
"Into the Zoo" PPT courseware 6
Practice and see who remembers it best
x+3=5
1.2x-2.5=3.5
The first question: x=2
Second question: x=5
Shanghai Wildlife Park is China's first wildlife park. There are a total of 16 Siberian tigers and white tigers in the park. Among them, the Siberian tiger is 7 times larger than the white tiger.
After seeing the above information, what do you want to know most? Tell us your questions!
How many Siberian tigers and white tigers are there? (Or, how many white tigers are there? How many Siberian tigers are there?)
There are only two pieces of mathematical information in the question.
(1) The total number of Siberian tigers and white tigers is 16.
(2) The number of Siberian tigers is 7 times that of white tigers.
When we can't find a good way, we must consider equations. Because equations are an important mathematical idea and a good tool for us to solve many mathematical problems.
If we use equations to solve this problem, based on previous experience, we have to set an unknown number.
There are two unknown quantities in this question. How do we set the unknown quantities?
Careful students have discovered that the 7 times in the question represents the relationship between the numbers of the two tigers. If we assume one of the unknowns, the other can also be expressed. for example:
Let us assume that the number of white tigers is x, then the number of Siberian tigers is 7x
After solving the problem of setting unknowns, let's take a look at the quantitative relationship in the question.
Express the equivalence relationship in words:
Number of white tigers + number of Siberian tigers = total number
That is: x+7x=16
Class summary (1) Students, what knowledge have you learned in this class? Share it with your classmates.
(2) Summary: The form is: ax+bx=c
1. Solve the equation: 4.3x+1.7x=18
2. There are 21 people in our school’s sports interest group, of which the number of boys is 2.5 times that of girls. How many boys and girls are there each?
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"Into the Zoo" PPT courseware 5:
"Into the Zoo" PPT Courseware 5 According to a report by CCTV International Channel on June 1, 2004, the number of Guizhou golden monkeys in Fanjingshan National Nature Reserve in Guizhou has increased from more than 600 in 1993 to more than 860. The number in 1993 + the increased number = the number in 2004. For example...
"Into the Zoo" PPT courseware 4:
"Into the Zoo" PPT Courseware 4 Teaching Objectives 1. Knowledge Objective: To enable everyone to understand the meaning of equations, the concepts of solutions to equations, and master the relationship between equations and equations. 2. Ability goal: Combined with teaching to cultivate everyone’s learning attitude of seeking truth from facts and being truthful and pragmatic..
"Into the Zoo" PPT courseware 3:
"Into the Zoo" PPT Courseware 3 Solve the following equations Equation 3x-2.4=3.6 Solution: 3x-2.4+2.4=3.6+2.4 3x=6 3x3=..