"The Mystery of the Human Body" PPT Courseware 2

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"The Mystery of the Human Body" PPT Courseware 2

In the seventeenth century, the mathematician Leibniz believed that the ratio of two quantities contained the meaning of division, but it could not occupy ÷, so he removed the small dash in the division sign and expressed it with:.

Zhao Fan walked 330 meters in 3 minutes. How to use a formula to express Zhao Fan's walking speed?

The ratio of distance to time is 330:3

1. In human blood, the average life span of red blood cells is 120 days, and the life span of platelets is only 10 days. Write the lifespan ratio of red blood cells to platelets.

2. A passenger plane flies 2,400 kilometers in 3 hours. Write down the ratio of the flight distance of this passenger plane to the time, find the ratio, and talk about the practical significance of the ratio.

A fraction represents a number: numerator (—) fraction line, denominator, fraction value

Division represents an operation: dividend (÷) division sign, divisor, quotient

Ratio expresses the relationship between two numbers. Antecedent term (:) ratio sign. Subsequent term ratio.

1. The standard basketball court length-to-width ratio is 28:15.

2. Give some biscuits to the children in the kindergarten class and the kindergarten class in a ratio of 5:4.

3. The ratio of the length of a person's feet to his height is about 1:7; the ratio of the length of a person's arms to his height is about 1:1; when a fist rolls around, the ratio of its length to the foot is about 1:1 …

4. The ratio of the earth’s ocean area to its land area is 63:27.

5. Nescafe coffee is made from a 2:5 mixture of white sugar and instant coffee. It tastes great!

6. Xohua high-definition digital color TV has a 4:3 wide screen, which is in line with future standards and provides great value for cinema enjoyment.

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Update Time: 2024-11-22

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