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"The Meaning and Basic Properties of Proportion" PPT courseware of direct proportion and inverse proportion
review
1. What is ratio?
The division of two numbers is also called the ratio of the two numbers.
2. What is ratio?
The quotient obtained by dividing the first term of a ratio by the second term of the ratio is called the ratio.
Find the ratio of each of the following ratios. What did you find?
12:16＝12÷16＝0.75
2.7∶4.5＝2.7÷4.5＝0.6
6∶10＝ 6 ÷ 10＝ 0.6
The results of 4.5:2.7 and 10:6 are the same, indicating that the two ratios are equal.
An expression that expresses the equality of two ratios is called a proportion.
fill in the blank
①. If the ratios of two ratios are equal, then the two ratios are ( ) proportional.
②. For a ratio, the ratio on the left side of the equal sign and the ratio on the right side of the equal sign must be ( ).
In a ratio, the two terms at the two ends are called the external terms of the ratio, and the two terms in the middle are called the internal terms of the ratio.
The difference between ratio and proportion:
Ratio means dividing two numbers and there are only two terms.
Proportion represents two equations whose ratios are equal and has four terms.
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"The Meaning and Basic Properties of Proportion" PPT Courseware of Direct Proportion and Inverse Proportion 2:
"The Meaning and Basic Properties of Proportion" PPT courseware of direct proportion and inverse proportion 2 Review preparation: (1) A car travels 160 kilometers in 4 hours, what is the ratio of distance to time? What does the ratio of this ratio mean? 160:4=40 ( The ratio of this ratio represents the speed) (2) Find the following..
"The Meaning and Basic Properties of Proportion" Proportion PPT courseware:
"The Meaning and Basic Properties of Proportion" Proportion PPT courseware teaching objectives [Knowledge and skill objectives.]: enable students to understand and master the meaning and basic properties of proportion, recognize the names of the various parts of proportion, and know the difference between ratio and proportion] 091;Teaching thinking and problem-solving goals]: Fully develop...