Dodatnia liczba stanowi liczby . Wówczas
y=1310x\displaystyle y= \frac{13}{10}x y=1013x\displaystyle y= \frac{13}{10}x
y=710x\displaystyle y= \frac{7}{10}x y=107x\displaystyle y= \frac{7}{10}x
y=107x\displaystyle y= \frac{10}{7}x y=710x\displaystyle y= \frac{10}{7}x
y=1013x\displaystyle y= \frac{10}{13}x y=1310x\displaystyle y= \frac{10}{13}x
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