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4.13: З'єднання алгебри
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$\frac{(\frac{1}{x} + 1) \cdot x}{(\frac{1}{x}) \cdot x} = \frac{1 + x}{3}, \nonumber$ \[\frac{(\frac{1}{a} - \frac{1}{b}) \cdot a \cdot b}{(ab) \cdot a \cdot b} = \frac{b - a}{a^{2} b^{2}} \ldotp ... $\frac{(\frac{1}{x} + 1) \cdot x}{(\frac{1}{x}) \cdot x} = \frac{1 + x}{3}, \nonumber$ $\frac{(\frac{1}{a} - \frac{1}{b}) \cdot a \cdot b}{(ab) \cdot a \cdot b} = \frac{b - a}{a^{2} b^{2}} \ldotp \nonumber$ $\frac{2 - \frac{1}{x}}{1 + \frac{1}{x}}, \qquad \frac{\frac{1}{x+h} + 3}{\frac{1}{x+h}}, \qquad \frac{1}{\frac{1}{a} + \frac{1}{b}}, \qquad \frac{\frac{1}{x+a} - \frac{1}{x}}{a} \ldotp \nonumber$