初等数学I · free preview

Integer Exponents

A power is shorthand for repeated multiplication. Same base: add exponents to multiply, subtract to divide, multiply for a power of a power. Zero and negative exponents are forced by these laws. We finish with look-alike expressions.

1. Powers: Shorthand for Repeated Multiplication

Powers: Shorthand for Repeated Multiplication

2. Which One Is Different

Which of the following is not equal to the other three?

3. Multiplying and Dividing Same-Base Powers

Multiplying and Dividing Same-Base Powers

4. Evaluate 3²·3³

Evaluate 32⋅333^{2}\cdot 3^{3}.

5. Evaluate 10⁶÷10³

Evaluate 106103\dfrac{10^{6}}{10^{3}}.

6. Examples: Combine Same Bases First, Then Compute

Examples: Combine Same Bases First, Then Compute

7. True or False: 2³·5³=10⁶

True or false: 23⋅53=1062^{3}\cdot 5^{3}=10^{6}.

8. Zero and Negative Exponents

Zero and Negative Exponents

9. Which Power Is Undefined

Which of the following is undefined?

10. Evaluate 2⁻⁴·2⁶·2⁻¹

Evaluate 2−4⋅26⋅2−12^{-4}\cdot 2^{6}\cdot 2^{-1}.

11. Power of a Power: Multiply the Exponents

Power of a Power: Multiply the Exponents

12. Examples: Powers of Powers and Stacking

Examples: Powers of Powers and Stacking

13. Practice: Power of a Power, Then Multiply

Evaluate (32)−2⋅35(3^{2})^{-2}\cdot 3^{5}.

14. Look-Alike Contrast: Sum or Product in the Numerator

Look-Alike Contrast: Sum or Product in the Numerator

15. Practice: Combine First, Then Divide

Evaluate 25⋅2−324⋅2−6\dfrac{2^{5}\cdot 2^{-3}}{2^{4}\cdot 2^{-6}}.

16. Practice: Different Bases Don't Combine

Evaluate 34⋅23⋅3−23^{4}\cdot 2^{3}\cdot 3^{-2}.

17. Practice: Group Mixed Bases

Evaluate 33⋅2−2⋅3−1⋅243^{3}\cdot 2^{-2}\cdot 3^{-1}\cdot 2^{4}.

18. Card: Laws of Exponents

What are the five laws of integer exponents (for b≠0b\neq0)?

19. Self-explain: Why b⁰=1

Why is b0=1b^{0}=1 stipulated (for b≠0b\neq0)? Start from the fraction bmbm\dfrac{b^{m}}{b^{m}}.

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