[tex] \frac{2}{23} \times \frac{3}{5} - \frac{2}{5} \times \frac{3}{46} = \\ \frac{2 \times 3}{23 \times 5} - \frac{2 \times 3}{5 \times 46} = \\ \frac{6}{115} - \frac{6}{230} [/tex]
6/230 se simplifica prin 2= 6:2/239:2=3/115
[tex] \frac{6}{115} - \frac{3}{115} = \frac{6 - 3}{115} = \frac{3}{115} [/tex]
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