Răspuns:
[tex] \frac{30}{7} - \frac{36}{42} = \frac{180}{42} - \frac{36}{42} = \frac{144}{42} = \frac{24}{7} [/tex]
Mai intai amplificam fractia 30/7 cu 6, iar fractia 144 o simplificam prin 6.
[tex] \frac{41}{6} - \frac{35}{30} = \frac{205}{30} - \frac{35}{30} = \frac{170}{30} = \frac{17}{3} [/tex]
Mai intai amplificam fractia 41/6 cu 5, iar fractia 170/30 o simplificam prin 10.
