"Power of Rational Numbers" PPT Courseware 2

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"Power of Rational Numbers" PPT Courseware 2

There is a piece of paper with a thickness of 1 micron. After folding it in half 50 times, please imagine how thick it is?

⑴ After folding twice, how many microns is the thickness?

2×2×1

⑵ After folding it in half three times, how many microns is the thickness?

2×2×2×1

⑶ After folding it in half 4 times, how many microns is the thickness?

2×2×2×2×1

⑷ After folding it in half 50 times, how many millimeters is the thickness?

2×2×2×…×2×1

When you want to express the multiplication of multiple identical factors, the above writing method is so troublesome! Is there an easy way to write it?

Multiply n identical factors a, that is, a·a·a·····a

We call it an;

This operation of finding the product of n identical factors is called exponentiation.

The result of exponentiation is called a power.

In an, a is called the base and n is called the exponent.

an is read as a raised to the nth power, and can also be read as a raised to the nth power.

1. Write the following multiplication expressions in power form:

1. 1×1×1×1×1×1×1=17;

2. 3×3×3×3×3=35;

3. (-3)×(-3)×(-3)×(-3)=(-3)4;

Knowledge sorting

1. Power is a special multiplication operation. The so-called special operation means that the factors multiplied by are the same;

2. Power is the result of the exponentiation operation; any power of a positive number is a positive number, the odd power of a negative number is a negative number, and the even power of a negative number is a positive number;

3. When performing exponentiation operations, the sign should be determined first and then calculated.

4. Any power of 0 and 1 is itself

Keywords: Teaching courseware for exponentiation of rational numbers, Qingdao edition seventh-grade mathematics PPT courseware download, seventh-grade mathematics slide courseware download, PPT courseware download for exponentiation of rational numbers, .PPT format;

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"Power of Rational Numbers" PPT courseware 4:

"Power of Rational Numbers" PPT Courseware 4 Collaborative Exploration 1: Fold in half twice and you can cut into 4 pieces, that is, 22 pieces; Fold in half three times and you can cut into 8 pieces, that is, 222 pieces; Question: If you fold in half 10 times, how many pieces can you cut into? ? Please use a formula to express it (no need to calculate the result). If you fold it in half 100 times, the formula...

"Power of Rational Numbers" PPT courseware 3:

"Power of Rational Numbers" PPT Courseware 3 Teaching Objectives Knowledge and Skills 1. Through examples, experience the process of generating the concept of power; 2. Understand the concepts of power, power, exponent, and base, and master the representation of power and power; 3. Understand the symbolic law of power and be able to carry out rational...

"Power of Rational Numbers" PPT courseware:

"Power of Rational Numbers" PPT courseware Take a test: 1. The operation of finding ____________________ is called exponentiation. The result of exponentiation is called __________. 2. 222222 is written as _______ and pronounced as ________. 2 is called _____, and 6 is called _____. 3. 777 is recorded as...

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Update Time: 2024-10-02

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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