422 B
422 B
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|---|---|
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Addition, subtraction
Addition is the inverse of subtraction: (x - a) + a = x (6 - 2) + 2 = 6
Subtraction is the inverse of addition: (x + a) - a = x (3 + 2) - 2 = 3
Division is the inverse of multiplication \frac{a \cdot x}{a} = x
\frac{6
\cdot 3}{6} = 3$$
Multiplication is the inverse of division a \cdot \frac{x}{a} = x
2 \cdot
\frac{8}{2} = 8$$