Welcome to the course
About the course
Examinations
1. Numerical calculations
1.1 Different types of numbers
1.2 Fractions
1.3 Powers
2. Algebra
2.1 Algebraic expressions
2.2 Linear expressions
2.3 Quadratic expressions
3. Roots and logarithms
3.1 Roots
3.2 Equations with roots
3.3 Logarithms
3.4 Logarithmic equations
4. Trigonometry
4.1 Angles and circles
4.2 Functions
4.3 Relations
4.4 Equations
5. Written mathematics
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Solution 1.3:3d
From Förberedande kurs i matematik 1
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Because
\displaystyle \,27 = 3\cdot 9 = 3\cdot 3\cdot 3 = 3^{3}
thus,
\displaystyle \frac{1}{27} = \frac{1}{3^{3}} = 3^{-3}
.
