"Powers of Rational Numbers" Rational Numbers PPT Courseware 3

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"Powers of Rational Numbers" Rational Numbers PPT Courseware 3

Think about it:

Observing the results of Example 1, can you find any rules in the signs of exponentiation operations?

Sign rules for exponentiation operations

Any power of a positive number is a positive number

Negative numbers raised to even powers are positive numbers, and odd powers raised to negative numbers are negative numbers.

Notice:

(1) When writing the power of a negative number, you must enclose the entire negative number (together with the symbol) in parentheses. This is also the way to identify the base.

(2) When writing a power of a fraction, the entire fraction must be enclosed in parentheses.

1. Decide whether the following questions are correct or not

①2³=2×3 ( )

②2+2+2=2³ ( )

③2³=2×2×2 ( )

2. Cut off half of a 1-meter-long stick the first time, and the remaining half the second time. If this continues, how long will the remaining stick be after the fifth time?

Mount Everest is the world's highest peak, with an altitude of 8,848 meters.

A large enough piece of paper with a thickness of 0.1 mm, folded in half 30 times in a row, can be thicker than Mount Everest. is this real?

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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 2:

"Powers 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 high the thickness is? ⑴ After folding twice, how many microns is the thickness? 221 ⑵ After folding it in half three times, how many microns is the thickness? 2221 ⑶ After folding in half 4 times, the thickness...

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Update Time: 2024-09-08

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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