Understanding Powers and Exponents in Mathematics

This page provides a comprehensive overview of powers and exponents in mathematics, focusing on their notation, calculation, and practical applications. The content is particularly relevant for students studying les puissances 4ème - exercices corrigés and those looking for Cours sur les puissances 4ème PDF.

The page begins by introducing the basic notation for powers. For any relative number 'a' and positive integer 'n', a^n is read as "a to the power of n" or "a exponent n". This notation represents the product of 'n' factors of 'a'.

Definition: a^n = a × a × a × ... × a (n factors equal to a)

The document then provides examples of powers and their decimal representations, starting from 2^1 up to 2^5. It also introduces negative exponents and their relationship to fractions.

Example: 2^3 = 2 × 2 × 2 = 8

For negative exponents, the document explains that a^(-n) = 1/a^n. This is a crucial concept in Puissance mathématique formule.

Highlight: For any positive integer n: a^(-n) = 1/a^n = 1/(a × a × ... × a) (n factors)

The page also covers special cases of exponents:

• a^0 = 1 for any non-zero number a
• a^1 = a for any number a

An important section of the page is dedicated to powers of 10, which are fundamental in the metric system and scientific notation. It provides a table showing powers of 10 from 10^(-9) to 10^12, along with their decimal representations and corresponding prefixes.

Vocabulary:

• Giga (G): 10^9
• Mega (M): 10^6
• Kilo (k): 10^3
• Milli (m): 10^(-3)
• Micro (μ): 10^(-6)
• Nano (n): 10^(-9)

The document concludes with algebraic laws for powers, which are essential for solving Exercices sur les puissances 4ème PDF:

1. For any integers m and n: 10^m × 10^n = 10^(m+n)
2. For any integers m and n: 10^m ÷ 10^n = 10^(m-n)
3. For any integers m and n: (10^m)^n = 10^(m×n)

These rules form the basis for more advanced calculations and problem-solving in Puissance 4ème Evaluation and Les puissances maths 4e exercices.